“Functions.” Counterexamples in Calculus, by Sergiy Klymchuk, REV - Revised, 1 ed., Mathematical Association of America, Washington, DC, 2010, pp. 13–14, www.jstor.org/stable/10.4169/j.ctt5hh9t5.6. Accessed 1 Aug. 2021.
Klymchuk, S. (2010). Functions. In Counterexamples in Calculus (pp. 13-14). Washington, DC: Mathematical Association of America. Retrieved August 1, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh9t5.6
Klymchuk, Sergiy. "Functions." In Counterexamples in Calculus, 13-14. Washington, DC: Mathematical Association of America, 2010. Accessed August 1, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh9t5.6.
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