D. Engelen, Frontdienst. De BVD in de Koude Oorlog. BMGN-LCHR [Internet]. 2009 Jan. 1 [cited 2024 Jul. 2];124(1):152-3. Available from: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107974