Haas, F. J. (1937). The Wages and Hours of American Labor. New York.
Lua i Stíl Chicago (17ú heag.)Haas, Francis J. The Wages and Hours of American Labor. New York, 1937.
Lua MLA (8ú heag.)Haas, Francis J. The Wages and Hours of American Labor. New York, 1937.
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