APA (7th ed.) Citation

Willett, R. H., & Willett, E. R. (1959). Statistics as applied to economics and business. Holt.

Chicago Style (17th ed.) Citation

Willett, Robert H., and Edward R. Willett. Statistics as Applied to Economics and Business. New York: Holt, 1959.

MLA (9th ed.) Citation

Willett, Robert H., and Edward R. Willett. Statistics as Applied to Economics and Business. Holt, 1959.