1. Actual causes of death in the United States;McGinnis;JAMA,1993
2. Smoking cessation during previous year among adults - United States, 1990 and 1991;Centers for Disease Control and Prevention;MMWR.,1993
3. Youth Risk Behavior Surveillance, United States 1999;Center for Disease Control and Prevention;MMWR.,2000
4. 5. Centers for Disease Control and Prevention, US Dep of Health and Human Services, Public Health Service. Preventing Tobacco Use Among Young People: A Report of the Surgeon General. 1994.