APA

Elliott D., Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) & Shell.Safety and health in offshore operations. : .

Chicago

Elliott D.H, Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Shell.Safety and health in offshore operations. : .

Harvard

Elliott D., Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Shell.Safety and health in offshore operations. : .

MLA

Elliott D.H, Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Shell.: . .