Cooper, D. R. S. (2012). Business Research Methods (11th ed.). McGraw Hill.
Cita Chicago (17th ed.)Cooper, Donald R; Schindler. Business Research Methods. 11th ed. New Delhi: McGraw Hill, 2012.
Cita MLA (9th ed.)Cooper, Donald R; Schindler. Business Research Methods. 11th ed. McGraw Hill, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.