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2015
UI - Tesis (Membership)
Porter, Michael E., author
Binarupa Aksara, 1994
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Erlangga, 1994
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Manajemen Usahawan Indonesia, XXXII (05) Mei 2003: 52-55, 2003
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Samola, Dorothea, author
2006
UI - Tesis (Membership)