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Buku Teks
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Buku Referensi
Anthony Rizal
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1993
UI - Skripsi Membership
Heinz GaÌ?rtner, Adrian Hyde-Price, Erich Reite, editor
Lynne Rienner Publishers, 2000
Buku Teks
Brown, J. F.
Frederick A. Preager, 1966
Buku Teks SO