Cooper, D. R., & Schindler, P. S. (2011). Business research methods (Eleventh edition.). McGraw-Hill/Irwin.
Cita Chicago (17th ed.)Cooper, Donald R., i Pamela S. Schindler. Business Research Methods. Eleventh edition. New York: McGraw-Hill/Irwin, 2011.
Cita MLA (9th ed.)Cooper, Donald R., i Pamela S. Schindler. Business Research Methods. Eleventh edition. McGraw-Hill/Irwin, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.