Não informado. (1971). British journal of mental subnormality. British Society for the Study of Mental Subnormality.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. British Journal of Mental Subnormality. Birmingham, Inglaterra: British Society for the Study of Mental Subnormality, 1971.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. British Journal of Mental Subnormality. British Society for the Study of Mental Subnormality, 1971.
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