Westerman, John
Bumi Aksara, 1989
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Westerman, John
Bumi Aksara, 1994
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Rowley, Chris, author
Rajawali, 2012
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Noe, Raymond A., author
Salemba Empat, 2010
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Gomez-Mejia, Luis R., author
Pearson Education, 2016
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