APA

Knudsen K. R., Hanssens O., Norwegian Petroleum Directorate, World Petroleum Congress (15th. : 1997 : Beijing), Hanssens O. & Norwegian Petroleum Directorate.National petroleum resource data management. : .

Chicago

Knudsen Kjell Reidar, Hanssens Olaw, Norwegian Petroleum Directorate, World Petroleum Congress (15th. : 1997 : Beijing), Hanssens Olaw and Norwegian Petroleum Directorate.National petroleum resource data management. : .

Harvard

Knudsen K. R., Hanssens O., Norwegian Petroleum Directorate, World Petroleum Congress (15th. : 1997 : Beijing), Hanssens O. and Norwegian Petroleum Directorate.National petroleum resource data management. : .

MLA

Knudsen Kjell Reidar, Hanssens Olaw, Norwegian Petroleum Directorate, World Petroleum Congress (15th. : 1997 : Beijing), Hanssens Olaw and Norwegian Petroleum Directorate.: . .