Siagian, Sondang P., author
Bumi Aksara, 2005
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Davis, William S., author
Erlangga, 1991
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Deni Darmawan, author
Remaja Rosdakarya, 2013
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Edhy Sutanta, author
Graha Ilmu, 2003
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Davis, William S., author
Erlangga, 1981
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