Office of Education.Projections of Educational Statistics to 1973-74. Washington, D.C., U.S. Department of Health, Education and Welfare, OE-10030. Circular 754, 1964.
2.
Surgeon General's Consultant Group on Medical Education.Physicians for a Growing America. Washington, D.C ., U.S. Department of Health, Education and Welfare, Public Health Service Publication 709 1959, p. 70.