Dennis Krebs, R. B. Psychology a first encounter. Harcourt Brace Jovanovich.
Lua i Stíl Chicago (17ú heag.)Dennis Krebs, Roger Blackman. Psychology a First Encounter. Harcourt Brace Jovanovich.
Lua MLA (8ú heag.)Dennis Krebs, Roger Blackman. Psychology a First Encounter. Harcourt Brace Jovanovich.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.