Anderson, D. R., Sweeney, D. J., & Williams, T. A. (2011). Statistics for business and economics (11th Ed.). Cengage South-Western ; Cengage Learning.

Anderson, David R., Dennis J. Sweeney, and Thomas Arthur Williams. Statistics for Business and Economics. 11th Ed. Eagan, MN : Delhi: Cengage South-Western ; Cengage Learning, 2011.

Anderson, David R., et al. Statistics for Business and Economics. 11th Ed. Cengage South-Western ; Cengage Learning, 2011.