Cita APA (7a ed.)

Wendt, A., & Friedman, M. (2008). Christian Achenbach.

Cita Chicago Style (17a ed.)

Wendt, Andreas, y Mario Friedman. Christian Achenbach. Berlin, 2008.

Cita MLA (8a ed.)

Wendt, Andreas, y Mario Friedman. Christian Achenbach. 2008.