Não informado. (1968). Journal of Comparative and Physiological Psychology. American Psychological Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Comparative and Physiological Psychology. Baltimore, Md: American Psychological Association, 1968.
Lua MLA (8ú heag.)Não informado. Journal of Comparative and Physiological Psychology. American Psychological Association, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.