APA (7th ed.) Citation

Niven, L., & Pournelle, J. (1977). Lucifer's hammer. Playboy Press.

Chicago Style (17th ed.) Citation

Niven, Larry, and Jerry Pournelle. Lucifer's Hammer. Chicago: Playboy Press, 1977.

MLA (9th ed.) Citation

Niven, Larry, and Jerry Pournelle. Lucifer's Hammer. Playboy Press, 1977.

Warning: These citations may not always be 100% accurate.