Palm, L.C. “K. Boersma, Inventing Structures for Industrial Research. A History of the Philips NatLab 1914-1946”. BMGN - Low Countries Historical Review 120, no. 1 (January 1, 2005): 152–153. Accessed November 21, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107088.