http://www.gulliver.it/cai/cf
http://www.guidealpine.lombardia.it
http://www.sac-cas.ch/huetten
http://www.swiss-sport.ch/sac-cas/huetten
http://castore.phys.uniroma1.it/Rifugi.html
http://www.worldsport.com/worldsport/sports/mountaineering
http://www.princeton.edu/~oa
http://www.nols.edu/Publications/FirstAid/FirstAid.html
http://www.nols.edu/Publications/MtneeringBook/MtneeringBook.html