Dyfyniad APA

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.

Dyfyniad Arddull Chicago

United 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.

Dyfyniad MLA

United 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.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.