ELTON, E. J., & GRUBER, M. J. (1987). Modern portopolio theory and investment analysis.--ed.3. John Wiley.

ELTON, Edwin J., and Martin J. GRUBER. Modern Portopolio Theory and Investment Analysis.--ed.3. New York: John Wiley, 1987.

ELTON, Edwin J., and Martin J. GRUBER. Modern Portopolio Theory and Investment Analysis.--ed.3. John Wiley, 1987.