„Chapter 5: North Sea” (PDF). Environmental Guidebook on the Enclosed Coastal Seas of the World. International Center for the Environmental Management of Enclosed Coastal Seas. 2003. Arhivirano iz originala na datum 2008-12-17. Pristupljeno 24 November 2008.
„About the North Sea: Key facts”. Safety at Sea project: Norwegian Coastal Administration. 2008. Arhivirano iz originala na datum 2008-12-09. Pristupljeno 2 November 2008.
Helland-Hansen, Bjørn; Fridtjof Nansen (1909). „IV. The Basin of the Norwegian Sea.”. Report on Norwegian Fishery and Marine-Investigations Vol. 11 No. 2. Geofysisk Institutt. Arhivirano iz originala na datum 2009-01-14. Pristupljeno 9 January 2009.
web.archive.org
Helland-Hansen, Bjørn; Fridtjof Nansen (1909). „IV. The Basin of the Norwegian Sea.”. Report on Norwegian Fishery and Marine-Investigations Vol. 11 No. 2. Geofysisk Institutt. Arhivirano iz originala na datum 2009-01-14. Pristupljeno 9 January 2009.
„About the North Sea: Key facts”. Safety at Sea project: Norwegian Coastal Administration. 2008. Arhivirano iz originala na datum 2008-12-09. Pristupljeno 2 November 2008.
„Chapter 5: North Sea” (PDF). Environmental Guidebook on the Enclosed Coastal Seas of the World. International Center for the Environmental Management of Enclosed Coastal Seas. 2003. Arhivirano iz originala na datum 2008-12-17. Pristupljeno 24 November 2008.