APA

Leonard M., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Global data provision through web-based interfaces and GIS on the shell intranet. : .

Chicago

Leonard Mark, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .Global data provision through web-based interfaces and GIS on the shell intranet. : .

Harvard

Leonard M., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Global data provision through web-based interfaces and GIS on the shell intranet. : .

MLA

Leonard Mark, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .: . .