“J. De Bas, Hervormd Op Wielen. Wielerkampioen Cees Erkelens (1889-1959)”. BMGN - Low Countries Historical Review 121, no. 3 (January 1, 2006): 546–548. Accessed November 22, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107443.