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              Rogers, C. R. (1951). Client-centered Therapy. Boston: Houghton Mifflin.
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              Rogers, C. R. (1951). Client-centered therapy. New York: Houghton Mifflin.
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              Rogers, C. R. (1951): Client-centered Therapy. Boston.
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              Rogers, C. R., Client-Centred Therapy, Boston 1951.
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              Rogers, Carl (1951): Client-Centered Therapy. Boston: Houghton Mifflin.
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              Rogers, Carl R. (1951): Client-centered Therapy. Boston
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