American cooperatives 1992
National Council of Farmer Cooperatives , 1992
 Buku Teks
Makkai, Adam
a Dictionary of American idioms
Barrons, 1995
 Buku Teks
Patrick, John
History of the American Nation
Macmillan Publishing Company, 1984
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Quint, Howard H
Main problems in American history
Dorsey Press, 1968
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Joselit, David, author
American art since 1945
Thames & Hudson world of art, 2003
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