M. de Keizer, Het parool (1940-45). Verzetsblad in oorlogstijd. BMGN - Low Countries Historical Review, [S. l.], v. 108, n. 3, p. 535–537, 1993. DOI: 10.18352/bmgn-lchr.3763. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104316.. Acesso em: 30 jun. 2024.