Horsnell, Paul
Oil markets and prices: the brent market and the formation of world oli prices
Oxford University Press, 1993
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International Petroleum encyclopedia 1990
editor, John C. McCaslin
PennWell Publishing , 1990
 Buku Referensi
International petroleum encyclopedia 1996
editor Jim West
PennWell Pub. Co., 1998
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Frankel, P.H.
Essentials of petroleum : a key to oil economics
Chapman and Hall, 1946
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Porter, Stanley P.
Petroleum accounting practices / Stanley P. Porter
McGraw-Hill, 1965
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