KOSTYŁO, Piotr. Two Sources of Justification. Paedagogia Christiana, [S. l.], v. 34, n. 2, p. 29–42, 2015. DOI: 10.12775/PCh.2014.021. Disponível em: https://apcz.umk.pl/PCh/article/view/PCh.2014.021. Acesso em: 14 may. 2026.