Bernstein, D. A., & Clarke-Stewart, . A. (1991). Psychology (2nd ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Bernstein, Douglas A., agus Alison Clarke-Stewart. Psychology. 2nd ed. Geneva: Houghton Mifflin, 1991.
Lua MLA (9ú heag.)Bernstein, Douglas A., agus Alison Clarke-Stewart. Psychology. 2nd ed. Houghton Mifflin, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.