APA (7th ed.) Citation

Heller, D., & Heller, D. (1964). The Berlin Wall (1. publ.). Muller.

Chicago Style (17th ed.) Citation

Heller, Deane, and David Heller. The Berlin Wall. 1. publ. London: Muller, 1964.

MLA (9th ed.) Citation

Heller, Deane, and David Heller. The Berlin Wall. 1. publ. Muller, 1964.