KEMPA, Tomasz. Unknown letters of the Metropolitan of Kiev Hipacy Pociej, an important source on the beginnings of the Brest Union. Odrodzenie i Reformacja w Polsce, [S. l.], p. 221–258, 2014. DOI: 10.12775/OiRwP.SI.2014.11. Disponível em: https://apcz.umk.pl/OR/article/view/OiRwP.SI.2014.11. Acesso em: 31 maj. 2026.