Barker, L. F. (1940). Psychotherapy. D. Appleton-Century Company, Inc.
Lua i Stíl Chicago (17ú heag.)Barker, L. F. Psychotherapy. New York: D. Appleton-Century Company, Inc, 1940.
Lua MLA (9ú heag.)Barker, L. F. Psychotherapy. D. Appleton-Century Company, Inc, 1940.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.