Παραπομπή APA

Gupta, P. K. (1991). Problems in operations research: Principles and solutions. S. chand & company.

Παραπομπή Chicago Style

Gupta, Prem Kumar. Problems in Operations Research: Principles and Solutions. New delhi: S. chand & company, 1991.

Παραπομπή MLA

Gupta, Prem Kumar. Problems in Operations Research: Principles and Solutions. S. chand & company, 1991.