1. Flexner medical education in the twentieth century. New York: Greenwood Press, 1992.
2. American Medical Association. Physicians characteristics and distribution in the U.S., Chicago: AMA Press, 2002.
3. Health Resources and Services Administration. Primary Care 2000: HRSA's long-range plan for health professionals. Rockville, MD: Author, 1991.
4. A physician workforce for the 21st century
5. Forecasting the Effects of Health Reform on US Physician Workforce Requirement