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Wilkins, P (2000). "Unconditional positive regard reconsidered". British Journal of Guidance & Counseling. 28 (1): 23–36. doi:10.1080/030698800109592.
nih.gov
pubmed.ncbi.nlm.nih.gov
Rogers, Carl (1957). "The necessary and sufficient of therapeutic personality change". Journal of Consulting Psychology. 21 (2): 95–103. doi:10.1037/h0045357. PMID13416422.