Zenz, Gary J. <br/><br/>Purchasing and the management of materials Gary J. Zenz  - Fifth Edition  - New York:  John Wiley and Sons Publishing,  1981  - xiii, 514 pages;  24 cm. <br/><br/>Includes bibliographical references and index. <br/><br/><label>LC Class. No.: </label>HD89.5  / Z47 1981