APA (7th ed.) Citation

Markowitz, H. M. (1991). Portfolio selection: Efficient diversification of investments (2nd ed.). Blackwell.

Chicago Style (17th ed.) Citation

Markowitz, Harry M. Portfolio Selection: Efficient Diversification of Investments. 2nd ed. Cambridge: Blackwell, 1991.

MLA (9th ed.) Citation

Markowitz, Harry M. Portfolio Selection: Efficient Diversification of Investments. 2nd ed. Blackwell, 1991.