HULL, Zbigniew. Ecophilosophy in Problems of Sustainable Development Journal. Problemy Ekorozwoju , [S. l.], v. 6, n. 1, p. 7–10, 2011. Disponível em: https://ph.pollub.pl/index.php/preko/article/view/4797. Acesso em: 20 feb. 2026.