APA (7th ed.) Citation

Foley, G. D. (2011). The Shape of an Ellipse. Mathematics Teacher, 105(4), 274.

Chicago Style (17th ed.) Citation

Foley, Gregory D. "The Shape of an Ellipse." Mathematics Teacher 105, no. 4 (2011): 274.

MLA (9th ed.) Citation

Foley, Gregory D. "The Shape of an Ellipse." Mathematics Teacher, vol. 105, no. 4, 2011, p. 274.