Al-Farhan I. (2014). Save the middle class Saudi. “Kingdom Saudi Gazette”. Monday, 14 July.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Benson J. (2014). Education is key for middle class, and Latinos are going to college more than ever. “Voxxi”. January 21, http://www.hispanictrending.net/2014/01/page/6/ [15.05.2016].
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Burch M. (2015). Family and Experience Are Key to Winning Hearts and Wallets of the Global Affluent Middle Class. “Market Watch”. 10 June, http://www.marketwatch.com/story/family-and-experiences-are-key-to-winning-the-heartsand-wallets-of-the-affluent-global-middle-class-2015-06-10-62035434 [15.05.2016].
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Carneiro J. (2014). Brazil election: Class divides voters ahead of run-off. “BBC News 24” October.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Chronicle Editorial Board (2015). Tuition Cut Would Be a Savings for Middle Class. 9 June.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    The Economist (2005). Middle of the class. Economist, 7/16, Vol. 376, Issue 8435.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Fedor L. (2015). Vast swathes of the middle class – those just about managing – are overlooked. Getty, 15 June.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Hamilton M., Hirszowicz M. (1995). Klasy i nierówności społeczne. Warszawa: Instytut Studiów Politycznych PAN.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Hauca H. (2013). Middle class erosion hurts all. „Newsday”, http://www.newsday.com/opinion/letters/letter-ludicrous-tying-levy-hate-crime-1.6651830, [10.05.2016]
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Kagaba C. (2014). Uganda’s angry classes. “Google Plus”. Saturday 14th of June. Facebook. December 20.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Ketchum J. (2013). Credit Henry Ford for growing ranks of nation’s middle class. “The Times Herald”, December 28.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Krueger A. (2014). Rich Man, Poor Man: The Middle Classes – Now You See Them, Now You Don’t. “Huffington Post”, January 2.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Longstreet J. (2015). Three nails in the middle-income family coffin. “American Thinker”. June 7.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Madland D. (2015). Trickle-down’s middle-class massacre: Failure of conservative economics should discredit these bankrupt ideas forever. Salon.com. 11 June.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Mason P. (2014). Who are the new middle classes around the world? You’d be surprised. “The Guardian”, Monday 20 January.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    McDill K. (2014). What is “Middle Class Income Range”? “Millionaire Corner”. July 2.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Ndzamela P. (2014). Economy would reel from a domestic workers strike. “BusinessDay”. July 30.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Menk Ellsworth H. (2014). Economic inequality is avoidable. “Chippewa Herald”, Dunn County News. July 14, http://chippewa.com/dunnconnect/news/opinion/letters/economic-inequalityis-avoidable/article_f6b6c4eb-0c95-555c-a2fb-55873f71725d.html [10.05.2016].
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Oliver Ch. (2014). The rich get richer while the middle class suffers. daltoncitizen.com February 23
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Pinnell G. (2015). Do you know the rules of poverty? “Highlands Today”. 14 June.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    PRYCE, EVERTON. 2013. The proletarianisation of the middle class, JamaicaObserver.com, Sunday, December 01. Gulf News. November 26.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Surmick S. (2014). Toomey not working for poor, middle class. Reading Eagle -NEWS.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Szacka B. (2003). Wprowadzenie do socjologii. Warszawa: Oficyna Naukowa.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Tittenbrun J. (2011). Economy in Society. Economic Sociology Revisited. Cambridge: Cambridge Scholars Publishing.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Tittenbrun J. (2013). Gospodarka w społeczeństwie. Wprowadzenie do strukturalizmu socjoekonomicznego. Poznań: Zysk.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Tittenbrun J. (2016a). The Middle Class Or You Only Live Twice. Munich: Grin Academic Publishing.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Tittenbrun J. (2016b). From Marx to Warner. Class and Stratification Under Scrutiny. Cambridge: Cambridge Scholars Publishing (w druku).
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Urciuoli B. (1993). Representing Class: Who Decides? “Anthropological Quarterly”, Vol. 66, Issue 4.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Warner W. L. (1942). Yanke City Series. New York, [w].
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Whitaker M. (2014). Santorum: Class doesn’t exist, ‘middle class’ is ‘leftist talk’. MSNBC. March 07.
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Wright D. S. (2014). Obama Backs Away From Inequality Debate To Comfort Corporate Democrats. “FDL News Desk”, Monday July 7, https://shadowproof.com/2014/07/07/obama-backs-away-from-inequality-debate-to-comfortcorporate-democrats/ [10.09.2016].
                                                                
                                                                Google Scholar
                                                            
                                                                                                                    Zakaria F. (2013). The ‘defining challenge’ of helping the poor. “The Washington Post”. December 20.
                                                                
                                                                Google Scholar