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Besser, J. F.  1978. Birds and sunflower. In: Carter, J. F., ed. Sunflower 
     science and technology. Madison, Wl: American Society of Agronomy, Crop
     Science of America, Soil Science of America, Inc.: 263-278.  

Booth, T. W.  1993. Bird dispersal techniques. In: Hygnstron, S. E.; Tim, 
     R. M.; Larson, G. E., eds. Prevention and control of wildlife damage.
     Lincoln, NE: University of Nebraska Cooperative Extension Service. 

Dolbeer, R. A.  1980. Blackbirds and corn in Ohio. Res. Publ.  136. Washington, DC:
     U.S. Department of the Interior, Fish and Wildlife Service.  18 p.

Dolbeer, R. A.  1993. Blackbirds. In: Hygnstron, S. E.; Tim, R. M.; Larson, 
     G. E., eds. Prevention and control of wildlife damage. Lincoln, NE: 
     University of Nebraska Cooperative Extension Service.

Kopp, D. D.; Carlson, R. B.; Cassel, J. F.  1980. Blackbird damage control. Circ.
     E-692. Fargo, ND: Cooperative Extension Service, North Dakota State 
     University. 5 p.

Robbins, C. S.; Brun, B.; Zim, H. S. 1983. Birds of North America: a guide to 
     field identification. New York: Golden Press. 360 p.