Kesselman, Mark, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Fried, Robert C., author
Prentice-Hall, 1980
Buku Teks
edited by Roy C. Macridis and Bernard E. Brown
Wadsworth, 1996
Buku Teks
McCormick, John, 1954-, author
Thomson Wadsworth, 2004
Buku Teks
Hauss, Charles, author
Thomson Learning, 2003
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