Não informado. (1968). Government Reports Index. U.S. Department of Commerce, National Technical Information Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Government Reports Index. Washington: U.S. Department of Commerce, National Technical Information Service, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Government Reports Index. U.S. Department of Commerce, National Technical Information Service, 1968.
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