APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Elton, Edwin J., and Martin Jay Gruber. Modern Portfolio Theory and Investment Analysis. 4a. ed. Nueva York: John Wiley, 1991.

MLA (9th ed.) Citation

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