Saunders, M., Lewis, P., & Thornhill, A. (2003). Research methods for business students (3rd edition.). Prentice Hall ; Pearson Education.

Saunders, Mark, Philip Lewis, and Adrian Thornhill. Research Methods for Business Students. 3rd edition. Harlow, England ; New York : India: Prentice Hall ; Pearson Education, 2003.

Saunders, Mark, et al. Research Methods for Business Students. 3rd edition. Prentice Hall ; Pearson Education, 2003.