Παραπομπή APA

Guy, R. K. (1981). Unsolved problems in number theory. Springer-Verlag.

Παραπομπή Chicago Style

Guy, Richard K. Unsolved Problems in Number Theory. New York: Springer-Verlag, 1981.

Παραπομπή MLA

Guy, Richard K. Unsolved Problems in Number Theory. Springer-Verlag, 1981.