Dulles, F. R. (1949). Labor in America: A history. Crowell.
Lua i Stíl Chicago (17ú heag.)Dulles, Foster Rhea. Labor in America: A History. New York: Crowell, 1949.
Lua MLA (9ú heag.)Dulles, Foster Rhea. Labor in America: A History. Crowell, 1949.
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