Não informado. (1964). MENTAL RETARDATION ABSTRACTS. National Clearinghouse for Mental Health Information.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. MENTAL RETARDATION ABSTRACTS. Bethesda, Md: National Clearinghouse for Mental Health Information, 1964.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. MENTAL RETARDATION ABSTRACTS. National Clearinghouse for Mental Health Information, 1964.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.