Margo, R. A. (2000). Wages and labor markets in the United States, 1820-1860. University of Chicago Press.
Lua i Stíl Chicago (17ú heag.)Margo, Robert A. Wages and Labor Markets in the United States, 1820-1860. Chicago: University of Chicago Press, 2000.
Lua MLA (9ú heag.)Margo, Robert A. Wages and Labor Markets in the United States, 1820-1860. University of Chicago Press, 2000.
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