FRĄCZEK, Z. Altruism as an attitude desirable for society - upbringing demands. KULTURA – PRZEMIANY – EDUKACJA, [S. l.], v. 4, p. 183–195, 2016. DOI: 10.15584/kpe.2016.4.11. Disponível em: https://journals.ur.edu.pl/kpe/article/view/5525. Acesso em: 11 jun. 2025.