APA (7th ed.) Citation

Heinlein, R. A. (1980). The number of the beast. Ballantine Books.

Chicago Style (17th ed.) Citation

Heinlein, Robert A. The Number of the Beast. New York: Ballantine Books, 1980.

MLA (9th ed.) Citation

Heinlein, Robert A. The Number of the Beast. Ballantine Books, 1980.