1. Norm Stability: A Longitudinal Analysis of Crowding and Related Norms in the Wilderness of Denali National Park and Preserve;J. Bacon;George Wright Forum,2001
2. Cole, D.; A. Watson; and J. Roggenbuck. 1995. “Trends in Wilderness Visitors and Visits: Boundary Waters Canoe Area, Shining Rock, and Desolation Wilderness.” USDA Forest Service Research Paper INT-483.
3. Toward an Understanding of Norm Prevalence: A Comparative Analysis of 20 Years of Research;M.P. Donnelly;Environmental Management,2000
4. Race, Ethnicity, and Use of the National Park System;M. Floyd;U.S. National Park Service Social Science Research Review,1999
5. Managing National Parks in a Multicultural Society: Searching for Common Ground;M. Floyd;George Wright Forum,2001