1. Anstey, D.A., S.K. Davis, D.C. Duncan, and M. Skeel. 1995. Distribution and habitat requirements of eight grassland songbird species in southern Saskatchewan. Saskatchewan Wetland Conservation Corp., Regina.
2. Arnold, T.W., and K.F. Higgins. 1986. Effects of shrub coverages on birds on North Dakota mixed-grass prairies. Can. Field-Nat. 100:10–14.
3. Bayha, K.D. 1964. Project A-30: history of the Woodworth study area with emphasis on land use. Unpublished report on file at Northern Prairie Science Center, Jamestown, ND.
4. Bent, A.C. 1968. Life histories of North American cardinals, grosbeaks, buntings, towhees, finches, sparrows, and allies. Dover Publications, New York.
5. Report submitted to Region 6;G Berkey,1993