Não informado. (1987). American Journal of Mental Retardation. American Association on Mental Retardation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. American Journal of Mental Retardation. Washington: American Association on Mental Retardation, 1987.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. American Journal of Mental Retardation. American Association on Mental Retardation, 1987.
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