Blew, J., Günther, K., Laursen, K., van Roomen, M., Südbeck, P., Eskildsen, K., and Potel, P., (2007): Trends of waterbird populations in the International Wadden Sea 1987-2004 - an update. P. xx – xx in Reineking & Südbeck, 2007. Seriously Declining Trends in Migratory Waterbirds: Causes-Concerns-Consequences. Proceedings of the International Workshop on 31 August 2006 in Wilhelmshaven, Germany. Wadden Sea Ecosystem No. 23. Common Wadden Sea Secretariat, Wadden Sea National Park of Lower Saxony, Institue of Avian Research, Joint Monitoring Group of Breeding Birds in the Wadden Sea, Wilhelmshaven, Germany.

Blew, J. & Südbeck, P. (2005): Migratory Waterbirds in the Wadden Sea 1980- 2000. Wadden Sea Ecosystem No. 20. Common Wadden Sea Secretariat, Trilateral Monitoring and Assessment Group, Joint Monitoring Group of Migratory Birds in the Wadden Sea, Wilhelmshaven, Germany.

Meltofte, H., J. Blew, J. Frikke, H.-U. Rösner, C. J. Smit (1994): Numbers and distribution of waterbirds in the Wadden Sea. Results and evaluation of 36 simultaneous counts in the Dutch-German-Danish Wadden Sea 1980-1991. IWRB Publ. 34 / Wader Study Group Bull. 49, Special Issue 192 p.

Poot, M., L. M. Rasmussen, M. van Roomen, H.-U. Rösner, P. Südbeck (1996): Migratory Waterbirds in the Wadden Sea 1993/94. Wadden Sea Ecosystem No. 5. Common Wadden Sea Secretariat and Trilateral Monitoring and Assessment Group, Wilhelmshaven, Germany. 79 p.

Rösner, H.-U., M. v. Roomen, P. Südbeck, L. M. Rasmussen (1994): Migratory Waterbirds in the Wadden Sea 1992/93. Wadden Sea Ecosystem No. 2. Common Wadden Sea Secretariat and Trilateral Monitoring and Assessment Group, Wilhelmshaven, Germany. 72 p.

Rösner, H.-U. (1993): The joint monitoring project for migratory birds in the Wadden Sea. Common Wadden Sea Secretariat, Wilhelmshaven, Germany. 16 p.