ŚLIWAK, J.; BARTCZUK, R. P. Altruism/Non-Altruism Questionnaire – Short Version: The Revision of the Method Based on Bifactor Analysis. Journal for Perspectives of Economic Political and Social Integration, [S. l.], v. 29, n. 1, p. 31–59, 2023. DOI: 10.18290/pepsi-2023-0002. Disponível em: https://czasopisma.tnkul.pl/index.php/jpepsi/article/view/3824. Acesso em: 21 jun. 2026.