Elton, Edwin J. Modern portfolio theory and investment analysis / Edwin J. Elton, Martin J. Gruber. - 3rd ed. - New York : Wiley, c1987. - xvii, 645 p. ISBN: 0471851132 Subjects--Topical Terms: Portfolio management.Investment analysis. LC Class. No.: HG4529.5 / .E47 1987 Dewey Class. No.: 332.6�19