O'Shaughnessy, John. Competitive marketing : a strategic approach / John O'Shaughnessy. - ELBS ed. - Boston : Unwin Hyman, 1988. - 460 p. : ill. ; 24 cm. Includes indexes. ISBN: 0044451172 Subjects--Topical Terms: Marketing--Management. Dewey Class. No.: 658.83 / OSC 1987