Patterson, C., & Watkins, C. E. (1996). Theories of psychotherapy (5th.ed.). Harpe Collins.

Patterson, C.H, and C. Edward Watkins. Theories of Psychotherapy. 5th.ed. New York: Harpe Collins, 1996.

Patterson, C.H, and C. Edward Watkins. Theories of Psychotherapy. 5th.ed. Harpe Collins, 1996.