APA

Masters C. D., Geological Survey, World Petroleum Congress (13th. : 1991 : Buenos Aires) & Geological Survey.World resources of crude oil and natural gas. : .

Chicago

Masters Charles D, Geological Survey, World Petroleum Congress (13th. : 1991 : Buenos Aires) and Geological Survey.World resources of crude oil and natural gas. : .

Harvard

Masters C. D., Geological Survey, World Petroleum Congress (13th. : 1991 : Buenos Aires) and Geological Survey.World resources of crude oil and natural gas. : .

MLA

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