Ćwiąkała-Małys, A., and M. Mościbrodzka. “Position of Chosen European Union Countries in Respect of Financial Efficiency of Higher Education in the Area of Didactics”. Economic and Environmental Studies, vol. 17, no. 1 (41), Nov. 2020, pp. 83-93, https://czasopisma.uni.opole.pl/index.php/ees/article/view/2717.