1. Astin, A. W.Who Goes Where to College. Chicago: Science Research Associates, 1965.
2. Cartter, A. M.An Assessment of Quality in Graduate Education. Washington, D. C.: American Council on Education, 1966.
3. Cartter, A. M., and Marshall, F. R.Labor Economics. Homewood, IL: Richard D. Irwin, Inc., 1972, p. 231.
4. Gourman, J.The Gourman Report. Phoenix, AZ: The Continuing Education Institute, 1967.
5. Roose, K. D., and Anderson, C. J.A Rating of Graduate Programs. Washington, D. C.: American Council of Education, 1970.