1. Adams, D., 1969. Frequency of occurrence of summer birds at the University of Michigan Biological Station. University of Michigan Biological Station archives. .
2. Global amphibian declines: a problem in applied ecology;Alford;Annual Review of Ecology and Systematics,1999
3. AOU, 1998. Checklist of North American Birds, seventh ed., American Ornithologists’ Union. Allen Press, Lawrence, KS.
4. Effect of changes in regional forest abundance on the decline and recover of a forest bird community;Askins;Wilson Bulletin,1987
5. Population declines in migratory birds in eastern North America;Askins;Current Ornithology,1990