APA (7 वां संस्करण) प्रशस्ति पत्र

Não informado. (1968). Government Reports Index. U.S. Department of Commerce, National Technical Information Service.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Não informado. Government Reports Index. Washington: U.S. Department of Commerce, National Technical Information Service, 1968.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Não informado. Government Reports Index. U.S. Department of Commerce, National Technical Information Service, 1968.

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