Dickinson, Duo, author
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Buku Teks
Universe , 2004
Buku Teks
Nida Ul Janna, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2014
UI - Tesis (Membership)
Sutro, Dirk, author
Van Nostrand Reinhold, 1994
Buku Referensi
Kohlmaier, Georg, author
MIT Press, 1986
Buku Teks