Keesing, Miriam. “Jaap W. Focke Machseh Lajesoumim. A Jewish Orphanage in the City of Leiden, 1890-1943 ”. TSEG - The Low Countries Journal of Social and Economic History 19, no. 3 (December 13, 2022): 185–186. Accessed January 22, 2025. https://tseg.nl/article/view/13011.