APA (7th ed.) Citation

Bulmer, K., & Purdom, T. (1964). Demons world. Ace Books.

Chicago Style (17th ed.) Citation

Bulmer, Kenneth, and Tom Purdom. Demons World. New York, N.Y.: Ace Books, 1964.

MLA (9th ed.) Citation

Bulmer, Kenneth, and Tom Purdom. Demons World. Ace Books, 1964.