ZECHA, Gerhard. Is ethics a science?. Folia Philosophica, [S. l.], v. 19, p. 155–169, 2001. DOI: 10.31261/fp.20857. Disponível em: https://journals.us.edu.pl/index.php/FOLIA/article/view/20857. Acesso em: 2 feb. 2026.