Cohen, A.E. “Huizinga Als Leids Hoogleraar”. BMGN - Low Countries Historical Review 88, no. 2 (January 1, 1973): 335–347. Accessed January 22, 2022. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-101929.