1. Biological Survey of the Bogs and Swamps of Northeastern Ohio;Aldrich;Amer. Midland Nat.,1943
2. Ecological Animal Geography;Allee,1951
3. 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.
4. The Life of Prairies and Plains;Allen,1967
5. Birds and Their Attributes;Allen,1925