Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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