APA (7th ed.) Citation

Shanks, D. (1978). Solved and unsolved problems in number theory (2a. ed.). Chelsea.

Chicago Style (17th ed.) Citation

Shanks, Daniel. Solved and Unsolved Problems in Number Theory. 2a. ed. Nueva York: Chelsea, 1978.

MLA (9th ed.) Citation

Shanks, Daniel. Solved and Unsolved Problems in Number Theory. 2a. ed. Chelsea, 1978.