APA (7th ed.) Citation

Elton, E. J., & Gruber, M. J. (1991). Modern portfolio theory and investment analysis (4th ed.). Wiley.

Chicago Style (17th ed.) Citation

Elton, Edwin J., and Martin J. Gruber. Modern Portfolio Theory and Investment Analysis. 4th ed. New York: Wiley, 1991.

MLA (8th ed.) Citation

Elton, Edwin J., and Martin J. Gruber. Modern Portfolio Theory and Investment Analysis. 4th ed. Wiley, 1991.