Newbold, P., Carlson, W. L., & Thorne, B. (2007). Statistics for business and economics (6th ed.). Prentice Hall.

Newbold, Paul, William L. Carlson, and Betty Thorne. Statistics for Business and Economics. 6th ed. Upper Saddle River, N.J.: Prentice Hall, 2007.

Newbold, Paul, et al. Statistics for Business and Economics. 6th ed. Prentice Hall, 2007.