Nemmers, Erwin Esser
McGraw-Hill, 1966
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Nemmers, Erwin Esser, author
Littlefield, Adam and Co., 1960
Buku Teks
Velasquez, Manuel G., author
Pearson, 2006
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Johnson, Rossall James, 1917-, author
LPEM - FEUI, 1961
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Handler, Milton
University Casebook, 1972
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