APA (7th ed.) Citation

De Camp, L. S., & Howard, R. E. (1980). The Spell of Conan. Ace Books.

Chicago Style (17th ed.) Citation

De Camp, L. Sprague, and Robert E. Howard. The Spell of Conan. New York: Ace Books, 1980.

MLA (9th ed.) Citation

De Camp, L. Sprague, and Robert E. Howard. The Spell of Conan. Ace Books, 1980.