Cita APA (7a ed.)

Heller, D. F., & Heller, D. (1963). The Berlin wall (2nd printing.). Walker.

Cita Chicago Style (17a ed.)

Heller, Deane Fons, y David Heller. The Berlin Wall. 2nd printing. New York: Walker, 1963.

Cita MLA (9a ed.)

Heller, Deane Fons, y David Heller. The Berlin Wall. 2nd printing. Walker, 1963.