1. Collins, J. (2001). Why some companies make the leap … and others don’t: good-to-great. New York: Harperbusiness.
2. Collins, J. (2005). Why business thinking is not the answer: good to great and the social sector: A monograph to accompany good to great. Boulder, CO: Jim Collins.
3. Koeppel, D. (2007, August). Best places to live + play: Mountain towns. National GeographicAdventure. Retrieved February 7, 2010, from
http://www.nationalgeographic.com/adventure/relocating/best-places-to-live-2007/mountains/mountains.html
4. Lawrence-Lightfoot, S. (2009). The third chapter: Passion, risk and adventure in the 25 years after 50. New York: Farrar, Straus and Giroux.