Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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