de Jong, F.; Bakker, J.F.; Dankers, N.M.J.A.; Dahl, K.; Jäppelt, W.; Madsen, P.B.; Kossmagk-Stephan, K.-J. (Ed.) (1993). Subregion 10: The Wadden Sea. Quality Status Report of the North Sea 1993. Common Wadden Sea Secretariat: Wilhelmshaven. 174 pp.
Deel van: Quality Status Report of the North Sea 1993. North Sea Task Force. International Council for the Exploration of the Sea: Denmark. , meer