APA

Stosur G. J., Frye K. N., World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) & Frye K. N.The future of extra heavy oil, natural bitumen, and shale oil. : .

Chicago

Stosur George J, Frye Keith N, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Frye Keith N.The future of extra heavy oil, natural bitumen, and shale oil. : .

Harvard

Stosur G. J., Frye K. N., World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Frye K. N.The future of extra heavy oil, natural bitumen, and shale oil. : .

MLA

Stosur George J, Frye Keith N, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Frye Keith N.: . .