United States. Department of Labor. (1979). Important events in American labor history, 1778-1978. The Dept. : for sale by the Supt. of Docs., U.S. Govt. Print. Off.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Department of Labor. Important Events in American Labor History, 1778-1978. [Washington, D.C.]: The Dept. : for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1979.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited States. Department of Labor. Important Events in American Labor History, 1778-1978. The Dept. : for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1979.
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