“Chords.” Trigonometric Delights, by Eli Maor, Princeton University Press, PRINCETON; OXFORD, 1998, pp. 20–29, www.jstor.org/stable/j.ctt1r2f46.8. Accessed 6 Aug. 2020.
Maor, E. (1998). Chords. In Trigonometric Delights (pp. 20-29). PRINCETON; OXFORD: Princeton University Press. Retrieved August 6, 2020, from www.jstor.org/stable/j.ctt1r2f46.8
Maor, Eli. "Chords." In Trigonometric Delights, 20-29. PRINCETON; OXFORD: Princeton University Press, 1998. Accessed August 6, 2020. www.jstor.org/stable/j.ctt1r2f46.8.
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