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Buku Teks
Thorp, Willard L., author
Organisation for Economic Co-operation and Development , 1964
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Laura Grace Gabriella, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Skripsi (Membership)
The OPEC Fund for International Development, 2000
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Pronk, Jan P., author
Yayasan Obor Indonesia, 1993
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