SCHUURSMA, R. G. van Roon, Protestants Nederland en Duitsland 1933-1941. BMGN - Low Countries Historical Review, [S. l.], v. 91, n. 1, p. 130–131, 1976. DOI: 10.18352/bmgn-lchr.1931. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102093. Acesso em: 23 apr. 2024.