Keller, G. (2005). Statistics for management and economics (7. ed., internat. student ed., [ohne CD-ROM].). Thomson/Brooks/Cole - South-Western.
Chicago-Zitierstil (17. Ausg.)Keller, Gerald. Statistics for Management and Economics. 7. ed., internat. student ed., [ohne CD-ROM]. Belmont, Calif: Thomson/Brooks/Cole - South-Western, 2005.
MLA-Zitierstil (9. Ausg.)Keller, Gerald. Statistics for Management and Economics. 7. ed., internat. student ed., [ohne CD-ROM]. Thomson/Brooks/Cole - South-Western, 2005.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.