Blumberg, Boris. Business research methods / Boris Blumberg, Donald R. Cooper, Pamela S. Schindler. - 2nd ed. - New York, NY : McGraw Hill, 2008. - xix, 685 p. : ill. (some col.) ; 25 cm. + 1 CD-ROM. ISBN: 9780077117450 Subjects--Topical Terms: Industrial management--Research.