Παραπομπή APA

Gupta, P. K., & Hira, D. (2002). Operations research. S. Chand & company.

Παραπομπή Chicago Style

Gupta, Prem Kumar, και D.S Hira. Operations Research. New Delhi: S. Chand & company, 2002.

Παραπομπή MLA

Gupta, Prem Kumar, και D.S Hira. Operations Research. S. Chand & company, 2002.