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Correll, D. and H. Correll. 1975. Aquatic and wetland plants of southwestern
     United States. Vol. I and II. Stanford University Press, Stanford, CA.
     
Cowardin, L. M., V. Carter, F. C. Golet and E. T. LaRoe. 1979. Classification 
     of wetlands and deepwater habitats of the United States. U.S. Fish Wildl. 
     Serv., Biol. Serv. Prog. FWS/OBS-79/31.
     
Fassett, N. C. 1957. A manual of aquatic plants. With revision appendix by 
     E. C. Ogden.  University of Wisconsin Press, Madison.
     
Godfrey, R. K. and J. W. Wooten. 1979. Aquatic and wetland plants of southeastern
     United States - Monocotyledons. University of Georgia Press, Athens.
     
Godfrey, R. K. and J. W. Wooten. 1981. Aquatic and wetland plants of southeastern
     United States - Dicotyledons. University of Georgia Press, Athens.
     
Great Plains Flora Association. 1977. Atlas of the flora of the Great Plains. 
     Iowa State University Press, Ames.
     
Great Plains Flora Association. 1986. Flora of the Great Plains. University 
     Press of Kansas, Lawrence.
     
Muenscher, W. C. 1944. Aquatic plants of the United States. Comstock Publishing
     Co., Inc., Ithaca, NY.
     
Ownbey, G. B. and T. Morley. 1991. Vascular plants of Minnesota: A checklist and 
     Atlas.  University of Minnesota Press, Minneapolis.
     
Stewart, R. E. and H. A. Kantrud. 1971. Classification of natural ponds and 
     lakes in the glaciated prairie region. U.S. Fish Wildl. Serv. Resource 
     Publ. 92.
     
Stewart, R. E. and H. A. Kantrud. 1972. Vegetation of prairie potholes, North 
     Dakota, in relation to quality of water and other environmental factors. 
     U.S. Geol. Surv. Prof. Paper 585-D.