Thompson, Virginia
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Buku Teks
Devillers, Philippe
Frederick A. Praeger, 1969
Buku Teks
Ambar Purwandari, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1995
UI - Skripsi (Membership)
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Kepustakaan Populer Gramedia, 2007
Buku Teks
Bodard, Lucien, author
Atlantic Monthly Press Book, 1967
Buku Teks