APA

Vincken L., Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) & Shell.The future for drilling equipment and techniques. : .

Chicago

Vincken L.M.J, Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Shell.The future for drilling equipment and techniques. : .

Harvard

Vincken L., Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Shell.The future for drilling equipment and techniques. : .

MLA

Vincken L.M.J, Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Shell.: . .