APA

Cooke C., Institute of Research and Projects for Oil and Gas, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) & Institute of Research and Projects for Oil and Gas.High-strength proppant extends deep well fracturing capabilities. : .

Chicago

Cooke C.E, Institute of Research and Projects for Oil and Gas, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Institute of Research and Projects for Oil and Gas.High-strength proppant extends deep well fracturing capabilities. : .

Harvard

Cooke C., Institute of Research and Projects for Oil and Gas, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Institute of Research and Projects for Oil and Gas.High-strength proppant extends deep well fracturing capabilities. : .

MLA

Cooke C.E, Institute of Research and Projects for Oil and Gas, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Institute of Research and Projects for Oil and Gas.: . .