(1978). Psychology survey. British Psychological Society.
Lua i Stíl Chicago (17ú heag.)Psychology Survey. Leicester. [Eng.]: British Psychological Society, 1978.
Lua MLA (9ú heag.)Psychology Survey. British Psychological Society, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.