KAŁUŻNY, Tadeusz. Going through transformations: problems and challenges of ecumenism. Polonia Sacra, [S. l.], v. 17, n. 2, p. 145–158, 2013. DOI: 10.15633/ps.372. Disponível em: https://czasopisma.upjp2.edu.pl/poloniasacra/article/view/372.. Acesso em: 6 oct. 2026.