Não informado. (1964). IBP news. International Council of Scientific Unions, Special Committee for the International Biological Programme.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. IBP News. London: International Council of Scientific Unions, Special Committee for the International Biological Programme, 1964.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. IBP News. International Council of Scientific Unions, Special Committee for the International Biological Programme, 1964.
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