Bachrawi Sanusi, author
Safin Akwa Muda, 1982
Buku Teks
Universitas Indonesia, 2005
UI - Skripsi (Membership)
Moran, Theodore H.
Resources for the Future, 1978
Buku Teks
Mandalangi, J. Pareira, author
Binacipta, 1986
Buku Teks
Harderer, Michael, author
OPEC Secretariat, 2011
Buku Referensi