APA

R.Cooper D. S., .Business Research Methods. NEW DELHI: Tata McGraw-Hill Publishing Company Limited,2009: .

Chicago

R.Cooper Donald/pamela S.Schindler, .Business Research Methods. NEW DELHI: Tata McGraw-Hill Publishing Company Limited,2009: .

Harvard

R.Cooper D. S., .Business Research Methods. NEW DELHI: Tata McGraw-Hill Publishing Company Limited,2009: .

MLA

R.Cooper Donald/pamela S.Schindler, .NEW DELHI: Tata McGraw-Hill Publishing Company Limited,2009: . .