Levin, Richard I. Quantitative approaches to management / Richard I. Levin, Charles A. Kirkpatrick. - 4th ed. - New York : McGraw-Hill, c1978. - xxi, 625 p. : ill. ; 25 cm. ISBN: 0070374236 LCCN: 78004615 LC Class. No.: T57.6 / .L48 1978 Dewey Class. No.: 658.4/03