1. Lost Person Behavior. A Search and Rescue Guide on Where to Look—for Land, Air, and Water.;Koester,2008
2. US National Park Service data: annual search and rescue reports. Data from 2003–2012. Available at: http://www.nps.gov/foia.htm. Accessed January 29, 2014
3. Mountain Search for the Lost Victim;Kelly,1973
4. Wilderness Search and Rescue: A Complete Handbook.;Setnicka,1981
5. Managing the Lost Person Incident,2007