Sperry,Len, & Sperry,Jon. (2023). Core Clinical Competencies in Counseling and Psychotherapy: Becoming a Highly Competent and Effective Therapist (2nd.). Routledge.
Chicago-viite (17. p.)Sperry,Len, ja Sperry,Jon. Core Clinical Competencies in Counseling and Psychotherapy: Becoming a Highly Competent and Effective Therapist. 2nd. New York & London: Routledge, 2023.
MLA-viite (9. p.)Sperry,Len, ja Sperry,Jon. Core Clinical Competencies in Counseling and Psychotherapy: Becoming a Highly Competent and Effective Therapist. 2nd. Routledge, 2023.
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