Heyrman, P. “P. Nefors, La Collaboration Industrielle En Belgique 1940-1945”. BMGN - Low Countries Historical Review 124, no. 2 (January 1, 2009): 304–306. Accessed December 22, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-108010.