1. U.S. National Health Survey, 1960: Peptic Ulcers Reported in Interviews, U.S. Public Health Service, Washington, D.C.
2. U.S. National Health Survey, 1961: Reporting of Hospitalization in the Health Interview Survey, Publication No. 584-DU, Public Health Service, Washington, D.C.
3. Health in California;State of California, Dept. of Public Health,1957
4. Kansas City Metropolitan Health Survey;Peterson,1959
5. Inadequacy of the medical history in the diagnosis of duodenal ulcer;Dunn;New Engl. J. Med.,1962