International Petroleum encyclopedia 1990
editor, John C. McCaslin
PennWell Publishing , 1990
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Variety International film guide 1996
edited by Peter Cowie
Hamlyn, 1995
Buku Referensi
Johnston, Daniel
International petroleum fiscal system and production sharing contracts
Penwell Books, 1994
Buku Teks
Turner, CMEP
International encyclopedia of art
Facts on File, 1996
Buku Teks
International Encyclopedia of goverment and politics
"S.Chand ,
Buku Teks