Donaldson, Bruce
German: an essential grammar
Routledge, 2006
Buku Teks SO
Ebert, Ronald J.
Business essential
Prentice-Hall, 1998
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Wessels, Dieter
Business German
Macmillan, 1992
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Bradley, Teresa
Essential mathematics for economics and business
John Wiley & Sons, 2002
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Dubois, Edward N.
Essential statistical method for business
McGraw-Hill, 1979
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