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McGraww-Hill, 1993
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Sasaki, Naoto
Pustaka Binaman Pressindo, 1985
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Baran Abdaha
2014
UI - Tugas Akhir
Michael R. Czinkota, Ilkka A. Ronkainen, Michael H. Moffet, Eugene O. Moynihan
Harcourt College publishers, 2001
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Globerman, Steven
Prentince-Hall, 1986
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