APA

Masters C. D., Attanasi E. D., US Geological Survey, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Attanasi E. D. & US Geological Survey.World resources of crude oil, natural gas, natural bitumen, and shale oil. : .

Chicago

Masters Charles D, Attanasi Emil D, US Geological Survey, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Attanasi Emil D and US Geological Survey.World resources of crude oil, natural gas, natural bitumen, and shale oil. : .

Harvard

Masters C. D., Attanasi E. D., US Geological Survey, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Attanasi E. D. and US Geological Survey.World resources of crude oil, natural gas, natural bitumen, and shale oil. : .

MLA

Masters Charles D, Attanasi Emil D, US Geological Survey, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Attanasi Emil D and US Geological Survey.: . .