APA (7th ed.) Citation

Irving, J. (1978). The world according to Garp: A novel. E. P. Dutton.

Chicago Style (17th ed.) Citation

Irving, John. The World According to Garp: A Novel. New York: E. P. Dutton, 1978.

MLA (9th ed.) Citation

Irving, John. The World According to Garp: A Novel. E. P. Dutton, 1978.