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 Buku Teks
Griffin, Ricky W.
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Addison-Wesley, 1995
 Buku Teks
International journal of business insights and transformation
ITM Business School, 2008
 Majalah, Jurnal, Buletin
Czinkota, Michael R.
International business
The Dryden Press, 1992
 Buku Teks
Business review
Pakistan: The Institut of Business Administration, 2007,
 Majalah, Jurnal, Buletin