A. Kobylarek, “Preface : Levels of resentment in the University of the Third Age”, JECS, vol. 7, no. 1, pp. 5–8, Jun. 2016, Accessed: Jul. 13, 2025. [Online]. Available: https://www.jecs.pl/index.php/jecs/article/view/10.15503jecs20161.5.8