Não informado. (2001). Annual report of the Bureau of Science, Philippine Islands. Bureau of Science.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Annual Report of the Bureau of Science, Philippine Islands. Manila: Bureau of Science, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Annual Report of the Bureau of Science, Philippine Islands. Bureau of Science, 2001.
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