1. Sixty-five plus in America. Current population reports, special studies;Hobbs,1996
2. Health, United States, with health and aging chartbook;National Center for Health Statistics,1999
3. Health, United States, 2007 with chartbook on trends in the health of Americans;National Center for Health Statistics,2007
4. 2010 Census Briefs: Age and sex composition; 2010. Available at: http://www.census.gov/prod/cen2010/briefs/c2010br-03.pdf. Accessed January 24, 2012.
5. Traumatic spinal cord injuries in southeast Turkey: an epidemiological study;Karamehmetoglu;Spinal Cord,1997