1. American Lung Association. (2015). State of the air 2015.
http://www.stateoftheair.org
. 28 May 2015.
2. Bedsworth, L. (2011). Air quality planning in California’s changing climate. Climatic Change, 111, 101–118.
3. Beyers, W. B., & Nelson, P. B. (2000). Contemporary development forces in the nonmetropolitan west: New insights from rapidly growing communities. Journal of Rural Studies, 16, 459–474.
4. Borrie, W. T., Davenport, M., Freimund, W. A., & Manning, R. E. (2002). Assessing the relationship between desired experiences and support for management actions at Yellowstone National Park using multiple methods. Journal of Park and Recreation Administration, 20, 51–64.
5. Resource Bulletin RMRS-RB-12;JP Brandt,2012