Trích dẫn APA

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

Trích dẫn kiểu Chicago

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

Trích dẫn MLA

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

Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.