Gaya APA

Cooper, D, R., Schindler, P, , S. (2011). Business Research Methods (Ed. 11). New York: Mc Graw Hill.

Gaya MLA

Cooper, Donald, R.., Schindler, Pamela, , S.. "Business Research Methods". Ed. 11 New York: Mc Graw Hill, 2011. E-Book.