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deCarvalho, Roy J. (1999). „Otto Rank, the Rankian Circle in Philadelphia, and the Origins of Carl Rogers' Person-Centered Psychotherapy”. History of Psychology. 2 (2): 132—148. PMID11623737. doi:10.1037/1093-4510.2.2.132.
Rogers, Carl R. (1966). „Client-centered therapy”. Ур.: Arieti, S. American handbook of psychiatry. 3. New York City: Basic Books. стр. 183—200. OCLC2565173.