1. Ballard, W. B., Whitman, J. S., and Gardner, C. L. 1987. Ecology of an exploited wolf population in south-central Alaska. Wildlife Monographs. 98: 1–54.
2. Curtis, J. T. 1959. The vegetation of Wisconsin. Madison, WI: The University of Wisconsin Press.
3. Finley, R. W. 1976. Geography of Wisconsin: a content outline. Madison, WI: Regents of the University of Wisconsin System.
4. Fritts, S. H. and Mech, L. D. 1981. Dynamics, movements, and feeding ecology of a newly protected wolf population in northwestern Minnesota. Wildlife Monograph. 80: 1–79.
5. Fuller, T. K. and Sampson, B. A. 1988. Evaluation of a simulated howling survey for wolves. Journal of Wildlife Management. 52: 60–63.