“Creative Problems.” Beautiful Mathematics, by Martin Erickson, 1st ed., Mathematical Association of America, Washington, DC, 2011, pp. 131–138, www.jstor.org/stable/10.4169/j.ctt13x0n39.10. Accessed 15 June 2021.
Erickson, M. (2011). Creative Problems. In Beautiful Mathematics (pp. 131-138). Washington, DC: Mathematical Association of America. Retrieved June 15, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0n39.10
Erickson, Martin. "Creative Problems." In Beautiful Mathematics, 131-38. Washington, DC: Mathematical Association of America, 2011. Accessed June 15, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0n39.10.
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