1. DHEW Pub.;S. Altman,1971
2. American Nurses' Association, Committee of State Boards of Nursing (1964), Comprehensive Guide for the Understanding of Examination Procedures, (New York: American Nurses' Association).
3. American Nurses' Association (1952, 1964), Facts About Nursing, (New York: American Nurses' Association).
4. American Nurses' Association (1979), The Study of Credentialing in Nursing: A New Approach, (Kansas City: American Nurses' Association).
5. Baker, S. (1977), Medical Licensing in America: An Early Liberal Reform, Unpublished Doctoral Dissertation, Department of Economics, Harvard University.