1. Anstey, D.A., Davis, S.K., Duncan, D.C., Skeel, M., 1995. Distribution and Habitat Requirements of Eight Grassland Songbird Species in Southern Saskatchewan. Saskatchewan Wetland Conservation Corporation, Regina, Saskatchewan, Canada, p. 11.
2. Effects of shrub coverages on birds of North Dakota mixed−grass Prairies;Arnold;Can. Field Nat.,1986
3. Shelterbelts and windbreaks in the Great Plains;Baer;J. For.,1989
4. Berkey, G., Crawford, R., Galipeau, S., Johnson, D., Lambeth, D., Kreil, R., 1993. A review of wildlife management practices in North Dakota: effects on nongame bird populations and habitats. Unpublished report submitted to Region 6. US Fish and Wildlife Service, Denver, Colorado, USA. p. 51.
5. Bio-monitors of stream quality in agricultural areas: fish vs. invertebrates;Berkman;Environ. Manage.,1986