Cita APA (7a ed.)

Barrett-Lennard, G. T. (1998). Carl Rogers' helping system: Journey and substance. SAGE Publications.

Cita Chicago Style (17a ed.)

Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. Los Angeles ; London: SAGE Publications, 1998.

Cita MLA (8a ed.)

Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. SAGE Publications, 1998.