APA (7th ed.) Citation

Coppel, W. A. Number theory: An introduction to mathematics. Springer.

Chicago Style (17th ed.) Citation

Coppel, William A. Number Theory: An Introduction to Mathematics. Berlin [u.a.]: Springer.

MLA (9th ed.) Citation

Coppel, William A. Number Theory: An Introduction to Mathematics. Springer.

Warning: These citations may not always be 100% accurate.