Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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