Gaya APA

Cooper, D, R., Schindler, P, S. (2001). Business research methods (7th.ed.). Hoboken, NJ: Mc Graw-Hill Book Company.

Gaya MLA

Cooper, Donald, R.., Schindler, Pamela, S.. "Business research methods". 7th.ed. Hoboken, NJ: Mc Graw-Hill Book Company, 2001. .