APA

Berg G. v. d., Burgt M. v. d., Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Burgt M. v. d. & Shell.The use of alternative energy resources and its impact on refinery efficiency. : .

Chicago

Berg G.J van den, Burgt M.J van der, Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Burgt M.J van der and Shell.The use of alternative energy resources and its impact on refinery efficiency. : .

Harvard

Berg G. v. d., Burgt M. v. d., Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Burgt M. v. d. and Shell.The use of alternative energy resources and its impact on refinery efficiency. : .

MLA

Berg G.J van den, Burgt M.J van der, Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Burgt M.J van der and Shell.: . .