APA

Daalen F. v., Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) & Shell.Research and development strategy in the upstream area. : .

Chicago

Daalen F van, Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Shell.Research and development strategy in the upstream area. : .

Harvard

Daalen F. v., Shell, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Shell.Research and development strategy in the upstream area. : .

MLA

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