VRIES, J. de. I.J. Blanken, Onder Duits beheer. Geschiedenis van Philips electronics N. V., IV, 1935-1950. BMGN - Low Countries Historical Review, [S. l.], v. 114, n. 4, p. 639–641, 1999. DOI: 10.18352/bmgn-lchr.5133. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105880. Acesso em: 4 may. 2024.