APA (7th ed.) Citation

Long, C. T. (1972). Elementary introduction to number theory (2. ed.). Heath.

Chicago Style (17th ed.) Citation

Long, Calvin T. Elementary Introduction to Number Theory. 2. ed. Lexington, Mass. <<[u.a.]>>: Heath, 1972.

MLA (9th ed.) Citation

Long, Calvin T. Elementary Introduction to Number Theory. 2. ed. Heath, 1972.