Berstein, D. A., & Roy, E. J. (1994). Psychology (3rd.ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Berstein, Douglas A., agus Edward J. Roy. Psychology. 3rd.ed. Geneva: Houghton Mifflin, 1994.
Lua MLA (9ú heag.)Berstein, Douglas A., agus Edward J. Roy. Psychology. 3rd.ed. Houghton Mifflin, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.