1. LIFE (ed.): Europe’s wetlands – status and trends. LIFE Focus, pp. 3–11 (2007)
2. Dahl, T.E.: Status and trends of wetlands in the conterminous United States 1998 to 2004. US Department of the Interior, Fish and Wildlife Service, Washington DC (2006)
3. Cowardin, L.M., Carter, V., Golet, F.C., LaRoe, E.T.: Classification of wetlands and deepwater habitats of the United States. US Fish & Wildlife Service, Washington DC (1979)
4. Mitsch, W.J. (ed.): Global Wetlands: Old World and New. Elsevier, Amsterdam (1994)
5. Sanderson, M.G.: Global Distribution of Freshwater Wetlands for use in STOCHEM. Hadley Centre Technical Note 32 (2001)