Não informado. Scientific information activities of federal agencies. U.S. National Science Foundation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Scientific Information Activities of Federal Agencies. Washington: U.S. National Science Foundation.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Scientific Information Activities of Federal Agencies. U.S. National Science Foundation.
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