DROŻDŻ, Alojzy. Powinność moralna. Śląskie Studia Historyczno-Teologiczne, [S. l.], v. 43, n. 2, p. 302–316, 2010. Disponível em: https://journals.us.edu.pl/index.php/ssht/article/view/16517. Acesso em: 14 mar. 2025.