Blumberg, Boris. Business research methods / Boris Blumberg, Donald R. Cooper and Pamela S. Schindler. - 4th ed. - London : McGraw-Hill Education, 2014. - xix, 500, [19] p. : ill. ; 28 cm. Includes index. ISBN: 9780077157487 Subjects--Topical Terms: Industrial management--Research. LC Class. No.: HD30.4 / .B58 2014