World Bank , 1991
Buku Teks
Venezia Ryanka Sutrisno, author
Fakultas Ilmu Komputer Universitas Indonesia, 2013
UI - Skripsi (Membership)
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Buku Teks
The Asia Foundation, 1997
Buku Teks
Pustaka Sinar Harapan, 1997
Buku Teks