1. Allison, P. D., and Stewart, J. A. (1974). Productivity differences among scientists: Evidence for accumulative advantage.American Sociological Review 39: 596?606.
2. American Universities and Colleges (1968). Washington, DC: American Council on Education.
3. American Universities and Colleges (1983). Washington, DC: American Council on Education.
4. American Universities and Colleges (1987). Washington, DC: American Council on Education.
5. Bayer A. E. (1970).College and University Faculty: A Statistical Description (Vol. 5, No. 5). Washington, DC: American Council on Education.