Keller, G., Bartel, H., & Warrack, B. (1994). Statistics for management and Economics (3rd. ed.). Duxbury.
Chicago Style (17th ed.) ZitazioaKeller, Gerald, Henry Bartel, eta Brian Warrack. Statistics for Management and Economics. 3rd. ed. Belmont: Duxbury, 1994.
MLA (9th ed.) ZitazioaKeller, Gerald, et al. Statistics for Management and Economics. 3rd. ed. Duxbury, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.