Guaspari, John. Theory why : in which the boss solves the riddle of quality / John Guaspari. - New York, N.Y. : AMACOM, American Management Association, c1986. - 121 p. : ill. ; 22 cm. ISBN: 0814458769 LCCN: 86047593 LC Class. No.: HD38 .G767 1986 / .G767 1986 Dewey Class. No.: 658.5/62