Majalah, Jurnal, Buletin
Moskow, Keith, author
McGraw-Hill, 2008
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Kibert, Charles J., author
John Wiley & Sons, 2005
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Clark, Woodrow W., II, author
Butterworth-Heinemann , 2010
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kRYGIEL, eDDY
Wiley Publishing, Inc, 2008
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