APA

Flemming D., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .The economic challenges of sustainable development. : .

Chicago

Flemming D.T, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .The economic challenges of sustainable development. : .

Harvard

Flemming D., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .The economic challenges of sustainable development. : .

MLA

Flemming D.T, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .: . .