Engelen, D. “F.A.C. Kluiters, De Nederlandse Inlichtingen- En Veiligheidsdiensten”. BMGN - Low Countries Historical Review 109, no. 3 (January 1, 1994): 504–506. Accessed May 7, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104493.