Stone, C. P. (1951). Comparative psychology (3rd ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Stone, Calvin Perry. Comparative Psychology. 3rd ed. New Jersey: Prentice-Hall, 1951.
Lua MLA (9ú heag.)Stone, Calvin Perry. Comparative Psychology. 3rd ed. Prentice-Hall, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.