Dechant, Jill A., Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, and Betty R. Euliss. (1999) 2002. Effects of Management Practices on Grassland Birds: Field Sparrow. Rev. ed. Jamestown, ND: Northern Prairie Wildlife Research Center. http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1135&context=usgsnpwrc