APA (7th ed.) Citation

Dudley, U. (1978). Elementary number theory (2nd ed.). W. H. Freeman.

Chicago Style (17th ed.) Citation

Dudley, Underwood. Elementary Number Theory. 2nd ed. San Francisco: W. H. Freeman, 1978.

MLA (9th ed.) Citation

Dudley, Underwood. Elementary Number Theory. 2nd ed. W. H. Freeman, 1978.