International Petroleum encyclopedia 1990
editor, John C. McCaslin
PennWell Publishing , 1990
 Buku Referensi
Variety International film guide 1996
edited by Peter Cowie
Hamlyn, 1995
 Buku Referensi
Eyffinger, Arthur
The international court of justice 1946 - 1996
Kluwer Law International, 1995
 Buku Referensi
Johnston, Daniel
International petroleum fiscal system and production sharing contracts
Penwell Books, 1994
 Buku Teks
International book publishing : an encyclopedia
edited by Philip G. Altbach, Edith S. Hoshino
Fitzroy Dearborn, 1995
 Buku Referensi