1. American Hiking Society (2015). Hiking Trails in America: Pathways to Prosperity. http://www.AmericanHiking.org
2. D’Antonio, A., Monz, C., Lawson, S., Newman, P., Pettebone, D., & Courtemanch, A. (2010). GPS Based Measurements of Backcountry Visitors in Parks and Protected Areas: Examples of Methods and Applications from Three Case Studies. Journal of Park and Recreation Administration, 28, 42-60.
3. English, D., & Bowker, J. M. (2018). Introduction to the Special Issue on Visitor Monitoring. Journal of Park and Recreation Administration, 36, IX-X.
4. Federal Highway Administration (FHWA) (2016). Traffic Monitoring Guide. FHWA-PL-17-003. https://www.fhwa.dot.gov/policyinformation/tmguide/
5. Recreational use in dispersed public lands measured using social media data and on-site counts