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2. Austin, J. E., G. R. Guntenspergen, H. T. Sklebar, and T. K. Buhl. 2001. Duck populations as indicators of landscape condition in the Prairie Pothole Region. Environmental Monitoring and Assessment 69:29–47.
3. Austin, J. E. and M. R. Miller. 1995. Northern pintail (Anas acuta). In A. Poole and F. Gill (eds.), The Birds of North America, No. 163. The Academy of Natural Sciences, Philadelphia, PA, USA, and The American Ornithologists’ Union, Washington, DC, USA.
4. FWS/OBS-79/31;L. M. Cowardin,1979
5. Cowardin, L. W., D. S. Gilmer, and L. M. Mechlin. 1981. Characteristics of central North Dakota wetlands determined from sample aerial photographs and ground study. Wildlife Society Bulletin 9: 280–288.