Tohutoro APA (7th ed.)
Barrett-Lennard, G. T. (1998). Carl Rogers' helping system: Journey and substance. SAGE Publications.
Tohutoru Kātū Chicago (17th ed.)
Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. Los Angeles ; London: SAGE Publications, 1998.
Tohutoro MLA (9th ed.)
Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. SAGE Publications, 1998.
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