APA (7th ed.) Citation

Niven, L. (1981). Ringworld (Ed. 1, print. 15.). Ballantine Books.

Chicago Style (17th ed.) Citation

Niven, Larry. Ringworld. Ed. 1, print. 15. New York: Ballantine Books, 1981.

MLA (9th ed.) Citation

Niven, Larry. Ringworld. Ed. 1, print. 15. Ballantine Books, 1981.