Cooper, Donald R. Business research methods / Donald R. Cooper, Pamela S. Schindler. - 9th ed. - Boston : McGraw-Hill, 2006. - xxi, 744 p. : ill. (some col.) ; 27 cm. - The McGraw-Hill/Irwin series operations and decision sciences. . Includes index. Includes bibliographical references. ISBN: 0072979232 (hbk. ) Subjects--Topical Terms: Industrial management--Research.