MACHNACZ, Jerzy. Steiniana. Wrocławski Przegląd Teologiczny, [S. l.], v. 17, n. 2, p. 257–259, 2009. DOI: 10.52097/wpt.3163. Disponível em: https://ojs.academicon.pl/wpt/article/view/3163. Acesso em: 9 sie. 2025.