“Preface.” Beyond the Quadratic Formula, by Ron Irving, 1st ed., Mathematical Association of America, 2013, pp. ix-xiv, www.jstor.org/stable/10.4169/j.ctt5hh9sp.2. Accessed 1 Aug. 2021.
Irving, R. (2013). Preface. In Beyond the Quadratic Formula (pp. Ix-Xiv). Mathematical Association of America. Retrieved August 1, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh9sp.2
Irving, Ron. "Preface." In Beyond the Quadratic Formula, Ix-Xiv. Mathematical Association of America, 2013. Accessed August 1, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh9sp.2.
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