APA

Bentley F., Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) & Shell.Downstream developments in established markets. : .

Chicago

Bentley F.W.P, Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Shell.Downstream developments in established markets. : .

Harvard

Bentley F., Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Shell.Downstream developments in established markets. : .

MLA

Bentley F.W.P, Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Shell.: . .