Cooper,Donald R. (2011). Business Research Methods (9th.). McGraw Hill Education.
Cita Chicago (17th ed.)Cooper,Donald R. Business Research Methods. 9th. McGraw Hill Education, 2011.
Cita MLA (9th ed.)Cooper,Donald R. Business Research Methods. 9th. McGraw Hill Education, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.