“P.J. Molenaar, De Luchtverdediging in De Meidagen 1940”. BMGN - Low Countries Historical Review 87, no. 2 (January 1, 1972): 262–265. Accessed November 23, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-101888.