APA استشهاد

Len Sperry. (2010). Core competencies in counseling and psychotherpay: Becoming a highly competent and effective therapist. Routledge.

استشهاد بنمط شيكاغو

Len Sperry. Core Competencies in Counseling and Psychotherpay: Becoming a Highly Competent and Effective Therapist. New York: Routledge, 2010.

MLA استشهاد

Len Sperry. Core Competencies in Counseling and Psychotherpay: Becoming a Highly Competent and Effective Therapist. Routledge, 2010.