Cita APA (7a ed.)
Barrett-Lennard, G. T. Carl Rogers' Helping System: Journey and Substance. Sage.
Cita estilo Chicago (17a ed.)
Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. Londres, Inglaterra: Sage.
Cita MLA (9a ed.)
Barrett-Lennard, Godfrey T. Carl Rogers' Helping System: Journey and Substance. Sage.
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