Crow, L. D. (1951). Mental hygiene (2nd ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Crow, Lester D. Mental Hygiene. 2nd ed. New York: McGraw-Hill, 1951.
Lua MLA (9ú heag.)Crow, Lester D. Mental Hygiene. 2nd ed. McGraw-Hill, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.