Waterfowl Tomorrow:US Dept of Interior, Fish and Wildlife Svc.
JP Linduska, Editor, 1964
Ducks, Geese and Swans of North America
Frank Bellrose
Stackpole Books, 1976
Flyways - Pioneering Waterfowl Management in North AmericaEdited by AS Hawkins, RC Hanson, HK Nelson, HM Reeves
US Dept of the Interior, Fish and Wildlife Service, 1984
Prairie Wetland Ecology
Edited by HR Murkin, AG van der Valk, WR Clark
Iowa State University Press, 2000