Gallinger, George W.
Mass. Addison-Wesley , 1987
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Gallinger, George W.
Massachusetts Addison-Wesley Publishing Co., 1991
Buku Teks
Elfram Gomgom, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Tesis (Membership)
Block, Stanley B., author
Japan Toppan, 1990
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Higgins, Robert C., author
McGraw-Hill, 2000
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