Fragile Legacy:  Rare Animals ofSouth Dakota,  Second edition, by: D.E. Ashton and E.M. Dowd.  2006.  South Dakota Game, Fish and Parks, Pierre, SD.  Report No. 91-04.

Fishes of South Dakota, by: R.M. Bailey and M.O. Allum.  1962.  University of Michigan, Ann Arbor, MI.

A Field Guide to Montana Fishes,  Third edition, by: G.D. Holton and H.E. Johnson.  2003.  Montana Fish, Wildlife and Parks, Helena, MT.

Peterson Field Guides:  Freshwater Fishes, by: L.M. Page. and B.M. Burr.  1991.  Houghton Mifflin Company.  New York, NY. 

Fishes of the Minnesota Region, Second edition, by: G.L. Philips, W.D. Schmid, and J.C. Underhill.  1991.  University of Minnesota Press, Minneapolis, MN.

Natural History of Minnesota Fishes,by N. Paulson & J. T. Hatch. 2009. In cooperation with the Minnesota Department of Natural Resources' MinnAqua Aquatic Program.  
The Natural History of Minnesota Fishes website is located at   http://hatch.cehd.umn.edu/research/fish/fishes/natural_history.html