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Buku Teks
Gospodnetic, Otis, author
Manning Pubcations Co., 2005
Buku Teks
Kraynak, Joe, author
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Buku Teks
Emery, Vince
Coriolis Group Books, 1995
Buku Teks
Lifandra Zahra, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2016
UI - Skripsi (Membership)