M. Polak, G. van Herwijnen, Wim Polak. Amsterdammer en sociaal-democraat. BMGN - Low Countries Historical Review, [S. l.], v. 119, n. 3, p. 452–453, 2004. DOI: 10.18352/bmgn-lchr.6129. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107021.. Acesso em: 16 nov. 2024.