“Cubic Polynomials, II.” Beyond the Quadratic Formula, by Ron Irving, 1st ed., Mathematical Association of America, 2013, pp. 109–142, www.jstor.org/stable/10.4169/j.ctt5hh9sp.8. Accessed 1 Aug. 2021.
Irving, R. (2013). Cubic Polynomials, II. In Beyond the Quadratic Formula (pp. 109-142). Mathematical Association of America. Retrieved August 1, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh9sp.8
Irving, Ron. "Cubic Polynomials, II." In Beyond the Quadratic Formula, 109-42. Mathematical Association of America, 2013. Accessed August 1, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh9sp.8.
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