Stewart, G. Bennett
N.Y. : HarperBusiness, 1991
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Ristu Bintoro
Fakultas Teknik Universitas Indonesia, 2012
UI - Tesis Open
Luo, Wenping
Cengage Learninge, 2012
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Steinby, Torsten
Government, 1971
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Koupelis, Theo
Jones & Bartlett learning, 2011
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