Diepen, Remco van. “D. Engelen, Frontdienst. De BVD in De Koude Oorlog”. BMGN - Low Countries Historical Review 124, no. 1 (January 1, 2009): 152–153. Accessed November 23, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107974.