APA (7th ed.) Citation

Heller, D., & Heller, D. (1961). The Berlin Crisis: Prelude to World War 3? (2. print.). Monarch Books.

Chicago Style (17th ed.) Citation

Heller, Deane, and David Heller. The Berlin Crisis: Prelude to World War 3? 2. print. Derby, Conn: Monarch Books, 1961.

MLA (9th ed.) Citation

Heller, Deane, and David Heller. The Berlin Crisis: Prelude to World War 3? 2. print. Monarch Books, 1961.