- World Health Organization (WHO), World Health Report, 1998.
- World Health Organization (WHO), World Health Report Executive Summary, 1998.
- Centers for Diseases Control and Prevention (CDC) Internet Site and published by Chen RT, Hibbs B. Vaccine Safety: Current and Future Challenges, Pediatric Annals 1998: 27 (7): 445-455.
- Centers for Disease Control and Prevention (CDC). Epidemiology & Prevention of Vaccine Preventable Diseases, Atkinson W, Hamborsky J, Wolfe S, (eds). 8th ed. Washington,DC:Public Health Foundation. 2004. p. 183, 197.
