Ducks Unlimited– a non-profit organization dedicated to conserving, restoring, and managing wetlands and associated habitats for North America's waterfowl. http://www.ducks.org/index.asp

Nassar, James R., Will E. Cohen, and Curtis R. Hopkins.  1993.  Waterfowl Habitat Management Handbook for the Lower Mississippi River Valley.  Ducks Unlimited, Mississippi Cooperative Extension, Arkansas Game and Fish Commission. 

State Waterfowl Association – non-profit organizations that are developed at a state level.  Conduct a search using your state’s name followed by “waterfowl association” to see if there is one in your area.

That Quail Place – commercial web site about propagating quail and other gamebirds. http://www.shaywood.com/

Waterfowl Management Handbook.  http://www.nwrc.usgs.gov/wdb/pub/wmh/contents.html