British Psychological Society. (1920). British Journal of Psychology. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)British Psychological Society. British Journal of Psychology. London: Cambridge University Press, 1920.
Lua MLA (8ú heag.)British Psychological Society. British Journal of Psychology. Cambridge University Press, 1920.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.