APA

Lewan M., Geological Survey, World Petroleum Congress (13th. : 1991 : Buenos Aires) & Geological Survey.Primary oil migration and expulsion as determined by hydrous pyrolisis. : .

Chicago

Lewan M.D, Geological Survey, World Petroleum Congress (13th. : 1991 : Buenos Aires) and Geological Survey.Primary oil migration and expulsion as determined by hydrous pyrolisis. : .

Harvard

Lewan M., Geological Survey, World Petroleum Congress (13th. : 1991 : Buenos Aires) and Geological Survey.Primary oil migration and expulsion as determined by hydrous pyrolisis. : .

MLA

Lewan M.D, Geological Survey, World Petroleum Congress (13th. : 1991 : Buenos Aires) and Geological Survey.: . .