Barrett-Lennard, G. T. (1998). Carl Rogers' helping system: Journey and substance. SAGE Publications.
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Dyfyniad Arddull Chicago
Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. Los Angeles ; London: SAGE Publications, 1998.
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Dyfyniad MLA
Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. SAGE Publications, 1998.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.