Saunders, M., Lewis, P., & Thornhill, A. (2012). Research methods for business students (6th ed.). Pearson.

Saunders, Mark, Philip Lewis, and Adrian Thornhill. Research Methods for Business Students. 6th ed. Harlow, England ; New York: Pearson, 2012.

Saunders, Mark, et al. Research Methods for Business Students. 6th ed. Pearson, 2012.