Cooper, D. R., Schindler, P. S., & Sharma, J. K. (2014). Business Research Methods (11th ed.). McGraw Hill Education (India) Pvt. Ltd.
Lua i Stíl Chicago (17ú heag.)Cooper, Donald R., Pamela S. Schindler, agus J. K. Sharma. Business Research Methods. 11th ed. New Delhi: McGraw Hill Education (India) Pvt. Ltd, 2014.
Lua MLA (9ú heag.)Cooper, Donald R., et al. Business Research Methods. 11th ed. McGraw Hill Education (India) Pvt. Ltd, 2014.
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