APA (7th ed.) Citation

Däniken, E. v. (1980). Signs of the gods? (1st American ed.). Putnam.

Chicago Style (17th ed.) Citation

Däniken, Erich von. Signs of the Gods? 1st American ed. New York: Putnam, 1980.

MLA (9th ed.) Citation

Däniken, Erich von. Signs of the Gods? 1st American ed. Putnam, 1980.