β€œIn Memoriam Mr. A.M. De Jonge 1893-1969”. BMGN - Low Countries Historical Review 86, no. 2 (January 1, 1971): 235–236. Accessed November 24, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107780.