1. Biological survey of the bogs and swamps of northeastern Ohio;Aldrich;Amer. Midland Nat,1943
2. Allen, A.A. 1914 The Red-winged Blackbird: A study in the ecology of a cat-tail marsh. Proc. Linnaean Soc. New York, Nos. 24–25: 43–128. (A pioneer study of lasting significance.)
3. Birds around the world: A geographical look at evolution and birds;Amadon,1966
4. American Ornithologists' Union 1983 Check-list of North American birds. 6th ed. Published by the Union: available from Allen Press, P.O. Box 368, Lawrence, Kansas 66044.
5. The avifaunal composition of Oregon White Oak stands;Anderson;Condor,1970