Keller, G., Bartel, H., & Warrack, B. (1994). Statistics for management and Economics (3rd. ed.). Duxbury.
Lua i Stíl Chicago (17ú heag.)Keller, Gerald, Henry Bartel, agus Brian Warrack. Statistics for Management and Economics. 3rd. ed. Belmont: Duxbury, 1994.
Lua MLA (9ú heag.)Keller, Gerald, et al. Statistics for Management and Economics. 3rd. ed. Duxbury, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.