Cita APA (7a ed.)

Clarkson, P., & Mackewn, J. (1993). Fritz Perls. Sage.

Cita Chicago Style (17a ed.)

Clarkson, Petruska, y Jennifer Mackewn. Fritz Perls. London: Sage, 1993.

Cita MLA (9a ed.)

Clarkson, Petruska, y Jennifer Mackewn. Fritz Perls. Sage, 1993.