Iacob, Ionut E., et al. “The V-Flex, Triangle Orientation, and Catalan Numbers in Hexaflexagons.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 103–108, www.jstor.org/stable/10.4169/j.ctt13x0ng0.16. Accessed 9 Aug. 2020.
Iacob, I., McLean, T., & Hua Wang. (2012). The V-flex, Triangle Orientation, and Catalan Numbers in Hexaflexagons. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 103-108). Mathematical Association of America. Retrieved August 9, 2020, from www.jstor.org/stable/10.4169/j.ctt13x0ng0.16
Iacob, Ionut E., T. Bruce McLean, and Hua Wang. "The V-flex, Triangle Orientation, and Catalan Numbers in Hexaflexagons." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 103-08. Mathematical Association of America, 2012. Accessed August 9, 2020. www.jstor.org/stable/10.4169/j.ctt13x0ng0.16.
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