Van Dormolen, Joop. Educational Studies in Mathematics, vol. 14, no. 2, 1983, pp. 215–218., www.jstor.org/stable/3482547. Accessed 17 Jan. 2021.
Van Dormolen, J. (1983). Educational Studies in Mathematics, 14(2), 215-218. Retrieved January 17, 2021, from http://www.jstor.org/stable/3482547
Van Dormolen, Joop. Educational Studies in Mathematics 14, no. 2 (1983): 215-18. Accessed January 17, 2021. http://www.jstor.org/stable/3482547.
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