Gaya APA

Cooper, D, R., Schindler, P, S. (2006). Business research methods (ed. 9). : McGraw-Hill.New York.

Gaya MLA

Cooper, Donald, R.., Schindler, Pamela, S.. "Business research methods ". ed. 9 : McGraw-Hill.New York, 2006. Koleksi World Bank.