1. Moser M, Prentice C, Frazier S. A global overview of wetland loss and degradation. Proceedings of the 6th Meeting of the Conference of Contracting Parties of the Ramsar Convention. 1996. pp. 21–31.
2. Frayer WE, Peters DD, Pywell HR. Wetlands of the California Central Valley: status and trends 1939 to mid-1980s. Portland, OR; 1989.
3. Functional equivalency between rice fields and seminatural wetland habitats;CS Elphick;Conserv Biol,2000