APA

Ognedal M., Norwegian Petroleum Directorate, World Petroleum Congress (15th. : 1997 : Beijing) & Norwegian Petroleum Directorate.Norway's preparations to ensure safe, environmental sound and efficient offshore drilling in environmentally harsh deep water areas. : .

Chicago

Ognedal Magne, Norwegian Petroleum Directorate, World Petroleum Congress (15th. : 1997 : Beijing) and Norwegian Petroleum Directorate.Norway's preparations to ensure safe, environmental sound and efficient offshore drilling in environmentally harsh deep water areas. : .

Harvard

Ognedal M., Norwegian Petroleum Directorate, World Petroleum Congress (15th. : 1997 : Beijing) and Norwegian Petroleum Directorate.Norway's preparations to ensure safe, environmental sound and efficient offshore drilling in environmentally harsh deep water areas. : .

MLA

Ognedal Magne, Norwegian Petroleum Directorate, World Petroleum Congress (15th. : 1997 : Beijing) and Norwegian Petroleum Directorate.: . .