References
- Acute conditions: incidence and associated disability: United States. July 1976—June 1977. National Health Survey, series 10. No. 125. Washington. DC: US Dept of Health. Education, and Welfare. 1978
- Current estimates from the Health Interview Survey: United States—1977. National Health Survey, series 10. No. 126. Washington. DC: US Dept of Health. Education. and Welfare. 1978
- Tillotson JR, Finland M. Bacterial colonization and clinical superinfection of the respiratory tract complicating antibiotic treatment of pneumonia. J Infect Dis 1969: 119: 597–624