APA (7th ed.) Citation

Ryan, T. M. (1978). Theory of portfolio selection. Macmillan.

Chicago Style (17th ed.) Citation

Ryan, Terence M. Theory of Portfolio Selection. London: Macmillan, 1978.

MLA (9th ed.) Citation

Ryan, Terence M. Theory of Portfolio Selection. Macmillan, 1978.

Warning: These citations may not always be 100% accurate.