APA (7th ed.) Citation

Ryan, T. M. (1978). Theory of portfolio selection (1. publ.). Macmillan.

Chicago Style (17th ed.) Citation

Ryan, Terence M. Theory of Portfolio Selection. 1. publ. London [u.a.]: Macmillan, 1978.

MLA (9th ed.) Citation

Ryan, Terence M. Theory of Portfolio Selection. 1. publ. Macmillan, 1978.