1. Arnold, T. W. 1994. A roadside transect for censusing breeding coots and grebes. Wildlife Society Bulletin 22:437–443.
2. Austin, J. E., T. K. Buhl, G. R. Guntenspergen, W. Norling, and H. T. Sklebar. 2001. Duck populations as indicators of landscape condition in the prairie pothole region. Environmental Monitoring and Assessment. In Press.
3. Batt, B. D. J., M. G. Anderson, C. D. Anderson, and F. D. Caswell. 1989. The use of prairie potholes by North American ducks. p. 204–227. In A. Van der Valk (ed.) Northern Prairie Wetlands, Iowa State University Press, Ames, IA, USA.
4. Cowardin, L. M. and R. J. Blohm. 1992. Breeding population inventories and measures of recruitment. p. 423–445. In B. D. J. Batt, A. D. Afton, M. G. Anderson, C. D. Ankney, D. H. Johnson, J. A. Kadlec, and G. L. Krapu (eds.) Ecology and Management of Breeding Waterfowl. University of Minnesota Press, Minneapolis, MN, USA.
5. FWS/OBS-79/31;L. M. Cowardin,1979