(1968). United States government correspondence manual. U.S. Government Printing Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States Government Correspondence Manual. Washington: U.S. Government Printing Office, 1968.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States Government Correspondence Manual. U.S. Government Printing Office, 1968.
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