Rugg, H. (1929). An introduction to American civilization: A study of economic life in the United States. Ginn and Company.
Lua i Stíl Chicago (17ú heag.)Rugg, Harold. An Introduction to American Civilization: A Study of Economic Life in the United States. Boston: Ginn and Company, 1929.
Lua MLA (9ú heag.)Rugg, Harold. An Introduction to American Civilization: A Study of Economic Life in the United States. Ginn and Company, 1929.
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