Elliott, Barry
Prentice Hall, Financial Times, 2008
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Bramadhani Tribuana
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2019
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Ferris, Kenneth R.
Richard D. Irwin, 1989
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Ferris, Kenneth R.
McGraw-Hill/Irwin, 1996
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Gibson, Charles H.
South Western College , 2001
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