Cita APA (7a ed.)

Wills, T. A., & Wills, T. A. (1982). Basic processes in helping relationships. Academic Pr.

Cita Chicago Style (17a ed.)

Wills, Thomas Ashby, y Thomas A. Wills. Basic Processes in Helping Relationships. New York [usw.]: Academic Pr, 1982.

Cita MLA (8a ed.)

Wills, Thomas Ashby, y Thomas A. Wills. Basic Processes in Helping Relationships. Academic Pr, 1982.