1. Centers for Disease Control & Prevention . ( 2004 ).Leading causes of death by race/ethnicity, all males—United States, 2004. Retrieved from http://www.cdc.gov/men/lcod/04males_by_race.pdf
2. Centers for Disease Control & Prevention . ( 2006 ).10 leading causes of death by age group, United States—2006. Retrieved from http://www.cdc.gov/injury/Images/LC-Charts/10lc%20-%20By%20Age%20Group%202006-7_6_09-a.pdf
3. Centers for Disease Control & Prevention . ( 2009 ).Health, United States,2008.With special feature on the health of young adults. Retrieved from http://www.cdc.gov/nchs/data/hus/hus08.pdf#026
4. Centers for Disease Control & Prevention . ( 2010 ).Chronic disease prevention and health promotion. Retrieved from http://www.cdc.gov/chronicdisease/index.htm