MEGENS, C. B.A. de Graaf, Over de muur. De DDR, de Nederlandse kerken en de vredesbeweging. BMGN - Low Countries Historical Review, [S. l.], v. 121, n. 1, p. 188–190, 2006. DOI: 10.18352/bmgn-lchr.6393. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107332. Acesso em: 3 may. 2024.