Walborn, F. S. (1996). Process variables: Four common elements of counselling and psychotherapy. Brooks/Colege Pub.
Chicago-referens (17:e uppl.)Walborn, Frederick S. Process Variables: Four Common Elements of Counselling and Psychotherapy. Pacific Grove, Calif: Brooks/Colege Pub, 1996.
MLA-referens (9:e uppl.)Walborn, Frederick S. Process Variables: Four Common Elements of Counselling and Psychotherapy. Brooks/Colege Pub, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.