APA استشهاد

Gupta P. K. & Hira D.S. Problems in operations research: Principles and solutions (2003.). S,Chand and company ltd.

استشهاد بنمط شيكاغو

Gupta P. K. و Hira D.S. Problems in Operations Research: Principles and Solutions. 2003. New Delhi: S,Chand and company ltd.

MLA استشهاد

Gupta P. K. و Hira D.S. Problems in Operations Research: Principles and Solutions. 2003. S,Chand and company ltd.