Não informado. (1964). MENTAL RETARDATION ABSTRACTS. National Clearinghouse for Mental Health Information.
Lua i Stíl Chicago (17ú heag.)Não informado. MENTAL RETARDATION ABSTRACTS. Bethesda, Md: National Clearinghouse for Mental Health Information, 1964.
Lua MLA (8ú heag.)Não informado. MENTAL RETARDATION ABSTRACTS. National Clearinghouse for Mental Health Information, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.