Sperry,Len, & Sperry,Jon. (2023). Core Clinical Competencies in Counseling and Psychotherapy: Becoming a Highly Competent and Effective Therapist (2nd.). Routledge.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sperry,Len, و Sperry,Jon. Core Clinical Competencies in Counseling and Psychotherapy: Becoming a Highly Competent and Effective Therapist. 2nd. New York & London: Routledge, 2023.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Sperry,Len, و Sperry,Jon. Core Clinical Competencies in Counseling and Psychotherapy: Becoming a Highly Competent and Effective Therapist. 2nd. Routledge, 2023.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.