Keller, G., Bartel, H., & Warrack, B. (1994). Statistics for management and Economics (3rd. ed.). Duxbury.
Cita Chicago (17th ed.)Keller, Gerald, Henry Bartel, i Brian Warrack. Statistics for Management and Economics. 3rd. ed. Belmont: Duxbury, 1994.
Cita MLA (9th ed.)Keller, Gerald, et al. Statistics for Management and Economics. 3rd. ed. Duxbury, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.