1. Accidents in North American Mountaineering. New York City, American Alpine Club, 1979
2. Macmahon B, Pugh TF: Epidemiology. Boston, Little, Brown & Co, 1970
3. Haddon W. Baker S: Injury control, in Clark DW, Macmahon B (eds): Preventive and Community Medicine, ed 2, Boston, Little, Brown & Co, 1980
4. Skiing Injuries: Epidemiologic Study