APA

Sandahl R. C., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Evolving North American energy markets & infrastructure. : .

Chicago

Sandahl Richard C, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .Evolving North American energy markets & infrastructure. : .

Harvard

Sandahl R. C., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Evolving North American energy markets & infrastructure. : .

MLA

Sandahl Richard C, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .: . .