Não informado. (1980). Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the National Academy of Sciences of the United States of America. Washington: National Academy of Sciences, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences, 1980.
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