APA (7th ed.) Citation

Hira, D. S., & Gupta, P. K. (1997). Operations Research. Modern Book Centre.

Chicago Style (17th ed.) Citation

Hira, D. S., and P. K. Gupta. Operations Research. New Delhi: Modern Book Centre, 1997.

MLA (9th ed.) Citation

Hira, D. S., and P. K. Gupta. Operations Research. Modern Book Centre, 1997.