Berger, R. L. (1982). Human behavior: A perpective for the helping professions (2ª ed.). Longman.
Lua i Stíl Chicago (17ú heag.)Berger, Robert L. Human Behavior: A Perpective for the Helping Professions. 2ª ed. Longman, 1982.
Lua MLA (9ú heag.)Berger, Robert L. Human Behavior: A Perpective for the Helping Professions. 2ª ed. Longman, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.