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Blokpoel, H. and G. D. Tessier.  1984.  Overhead wires and
     monofilament lines exclude ring-billed gulls from public
     places. Wildlife Society Bulletin 12:55-58.
     
Cowardin, L. M., V. Carter, F. G. Golet, and E. T. LaRoe.  1979.
     Classification of wetlands and deepwater habitats of the
     United States.  U.S. Fish & Wildlife Service. Biol. Serv.
     Program FWS/OBS-79/31.
     
Duebbert, H. F., E. T. Jacobson, K. F. Higgins, and E. B. Podoll.
     1981.  Establishment of seeded grasslands for wildlife
     habitat in the prairie pothole region.  U.S. Fish & Wildlife
     Service. Special Scientific Report-Wildlife 234. 21pp.

Giroux, J-F.  1981.  Use of artificial islands by nesting
     waterfowl in southeastern Alberta. The Journal of Wildlife
     Management 45:669-679.

Higgins, K. F.  1986.  Further evaluation of duck nesting on
     small man-made islands in North Dakota. Wildlife Society
     Bulletin 14:155-157.
     
Johnson, D. H. and T. L. Shaffer.  1990.  Estimating nest
     success: when Mayfield wins. The Auk 107:595-600.

Jones, J. D.  1975.  Waterfowl nesting island development.
     USDI-BLM, Federal Center Building 50, Denver, CO 80225.
     Technical Note 260. 17pp.

Klett, A. T., H. F. Duebbert, C. A. Faanes, and K. F. Higgins.
     1986.  Techniques for studying nest success of ducks in
     upland habitats in the prairie pothole region.  U.S. Fish &
     Wildlife Service. Resource Publication 158. 24pp.

Lokemoen, J. T.  1984.  Examining economic efficiency of
     management practices that enhance waterfowl production.
     Transactions of the North American Wildlife and Natural
     Resources Conference 49:584-607.

Lokemoen, J. T., H. F. Duebbert, and D. E. Sharp.  1984.  Nest
     spacing, habitat selection, and behavior of waterfowl on
     Miller Lake Island, North Dakota. The Journal of Wildlife
     Management 48:309-321.

Lokemoen, J. T. and R. O. Woodward.  1992.  Nesting waterfowl and
     water birds on natural islands in the Dakotas and Montana.
     Wildl. Soc. Bull. 20:163-171.

Messmer, T. A., M. A. Johnson, and F. B. Lee.  1989.  Homemade
     nest sites for mallards. North Dakota State University
     Extension Service, Fargo, ND. Circular WL-890. 8pp.

Stewart, R. E. and H. A. Kantrud.  1971.  Classification of
     natural ponds and lakes in the glaciated prairie region.
     U.S. Fish & Wildlife Service. Resource Publication 92. 57pp.

Zenner, G. G., T. G. LaGrange, and A. W. Hancock.  1992.  Nest
     structures for ducks and geese. Iowa Department Natural
     Resources. Des Moines, IA. 34pp.