McClave, J. T., & Benson, P. G. (1994). Statistics for business and economics (6th ed.). Dellen ; Maxwell Macmillan Canada ; Maxwell Macmillan International.

McClave, James T., and P. George Benson. Statistics for Business and Economics. 6th ed. New York : Toronto : New York: Dellen ; Maxwell Macmillan Canada ; Maxwell Macmillan International, 1994.

McClave, James T., and P. George Benson. Statistics for Business and Economics. 6th ed. Dellen ; Maxwell Macmillan Canada ; Maxwell Macmillan International, 1994.