APA-referens (7:e uppl.)

Wessel, R. H., & Willett, E. R. (1965). Statistics as applied to economics and business (Rev. ed.). Holt, Rinehart and Winston, Inc.

Chicago-referens (17:e uppl.)

Wessel, Robert H., och Edward R. Willett. Statistics as Applied to Economics and Business. Rev. ed. New York: Holt, Rinehart and Winston, Inc, 1965.

MLA-referens (9:e uppl.)

Wessel, Robert H., och Edward R. Willett. Statistics as Applied to Economics and Business. Rev. ed. Holt, Rinehart and Winston, Inc, 1965.