References
- July 1957 . Health Statistics from the U.S. National Health Survey: Arthritis and Rheumatism Reported in Interviews: United States , Series B Vol. 20 , July , U.S. Department of Health, Education, and Welfare, Public Health Service . June, 1959
- July 1957 . Health Statistics from the U.S. National Health Survey: Heart Conditions and High Blood Pressure Reported in Interviews: United States , Series B Vol. 13 , July , U.S. Department of Health, Education, and Welfare, Public Health Service . June, 1958