Worchel, S., & Shebilske, W. (1989). Psychology: Principles and applications (3rd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Worchel, Stephen, agus Wayne Shebilske. Psychology: Principles and Applications. 3rd ed. New Jersey: Prentice Hall, 1989.
Lua MLA (9ú heag.)Worchel, Stephen, agus Wayne Shebilske. Psychology: Principles and Applications. 3rd ed. Prentice Hall, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.