Heerma van Voss, Lex. “Goffe T. Jensma, De Gemaskerde God. François Haverschmidt En Het Oera Linda-Boek”. TSEG - The Low Countries Journal of Social and Economic History 4, no. 1 (March 15, 2007): 150–152. Accessed April 11, 2026. https://testplatform.openjournals.nl/tseg/article/view/7836.