Não informado. (1974). Special Education. National Council for Special Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Special Education. London: National Council for Special Education, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Special Education. National Council for Special Education, 1974.
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