APA (7th ed.) Citation

Nagell, T. (1951). Introduction to number theory. John Wiley & Sons.

Chicago Style (17th ed.) Citation

Nagell, Trygve. Introduction to Number Theory. New York: John Wiley & Sons, 1951.

MLA (9th ed.) Citation

Nagell, Trygve. Introduction to Number Theory. John Wiley & Sons, 1951.