APA (7th ed.) Citation

Coppel, W. (2009). Number Theory: An Introduction to Mathematics. Springer New York.

Chicago Style (17th ed.) Citation

Coppel, W.A. Number Theory: An Introduction to Mathematics. New York, NY: Springer New York, 2009.

MLA (8th ed.) Citation

Coppel, W.A. Number Theory: An Introduction to Mathematics. Springer New York, 2009.