MUSIAŁ, Mateusz. “Changes in the Standard of Living of Chosen Countries That Joined the European Union After 2004”. Economic and Environmental Studies 18, no. 4 (48) (November 26, 2020): 1295–1307. Accessed November 17, 2024. https://czasopisma.uni.opole.pl/index.php/ees/article/view/2787.