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.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (9ú heag.)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.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.