Graaff, B.G.J. de. “C. Wiebes, B. Zeeman, Indonesische Dagboeknotities Van Dr. H. N. Boon 1946-1949”. BMGN - Low Countries Historical Review 103, no. 2 (January 1, 1988): 306–307. Accessed December 22, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103346.