1. The value of the world's ecosystem services and natural capital;Costanza;Nature,1997
2. Michigan Wetlands – Yours to Protect: A Citizens Guide to Wetland Protection;Cwikiel,2003
3. Status and trends of wetlands in the conterminus United States 1986–1997;Dahl,2000
4. Wetland losses in the United States 1780s to 1980s;Dahl,1990
5. Guide to Wetlands;Dugan,2005