National Science Foundation (U.S.). (1969). Scientific technical and health personnel in the federal government 1969. U.S. Government Printing Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Science Foundation (U.S.). Scientific Technical and Health Personnel in the Federal Government 1969. Washington, D.C: U.S. Government Printing Office, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Science Foundation (U.S.). Scientific Technical and Health Personnel in the Federal Government 1969. U.S. Government Printing Office, 1969.
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