APA (7th ed.) Citation

Scheer, K. (1972). The immortal unknown (American ed.). Ace Books.

Chicago Style (17th ed.) Citation

Scheer, K.-H. The Immortal Unknown. American ed. New York: Ace Books, 1972.

MLA (9th ed.) Citation

Scheer, K.-H. The Immortal Unknown. American ed. Ace Books, 1972.