Cita APA (7a ed.)

Gaines, J., & Youngreen, G. R. (1979). Fritz Perls, here and now. Celestial Arts.

Cita Chicago Style (17a ed.)

Gaines, Jack, y G. Russ Youngreen. Fritz Perls, Here and Now. Millbrae, California: Celestial Arts, 1979.

Cita MLA (9a ed.)

Gaines, Jack, y G. Russ Youngreen. Fritz Perls, Here and Now. Celestial Arts, 1979.