Waters,Donald. (1998). Essential quantitative methods: A guide for business. Addison - Wesley Publishing Co.
Παραπομπή Chicago StyleWaters,Donald. Essential Quantitative Methods: A Guide for Business. England: Addison - Wesley Publishing Co, 1998.
Παραπομπή MLAWaters,Donald. Essential Quantitative Methods: A Guide for Business. Addison - Wesley Publishing Co, 1998.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.