ZEILSTRA, J. Vefie Poels, De rode paus. Biografie van Willem van Rossum CSSR (1854-1932) . BMGN - Low Countries Historical Review, [S. l.], v. 138, 2023. DOI: 10.51769/bmgn-lchr.13632. DisponĂ­vel em: https://bmgn-lchr.nl/article/view/13632. Acesso em: 9 jun. 2023.