APA (7th ed.) Citation

Mathematical Association of America, Benjamin, A., & Brown, E. (2009). Biscuits of number theory. Mathematical Association of America.

Chicago Style (17th ed.) Citation

Mathematical Association of America, Arthur Benjamin, and Ezra Brown. Biscuits of Number Theory. Washington, D.C.: Mathematical Association of America, 2009.

MLA (9th ed.) Citation

Mathematical Association of America, et al. Biscuits of Number Theory. Mathematical Association of America, 2009.