APA
Koelmel M., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Transformation of global energy markets. : .
Chicago
Koelmel M.H, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .Transformation of global energy markets. : .
Harvard
Koelmel M., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Transformation of global energy markets. : .
MLA
Koelmel M.H, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .: . .
