Effects of Redhead Nest Parasitism on MallardsLarry G. Talent, Gary L. Krapu and Robert L. Jarvis · The Wilson Bulletin · 1981

Waterfowl Ecology and ManagementKrapu, Gary L. · The Auk · 2007

Age Determination of MallardsGary L. Krapu, Douglas H. Johnson and Charles W. Dane · The Journal of Wildlife Management · 1979

Marsh Nesting by MallardsGary L. Krapu, Larry G. Talent and Thomas J. Dwyer · Wildlife Society Bulletin · 1979

Feeding Ecology of Pintail Hens during ReproductionGary L. Krapu · The Auk · 1974

Pintail Reproduction Hampered by Snowfall and AgricultureGary L. Krapu · The Wilson Bulletin · 1977

Foods of Breeding Pintails in North DakotaGary L. Krapu · The Journal of Wildlife Management · 1974

The Role of Nutrient Reserves in Mallard ReproductionGary L. Krapu · The Auk · 1981