APA (7th ed.) Citation

Gupta, P. K., & Hira, D. S. (1994). Problems in Operation Research. Sultan Chand & Sons.

Chicago Style (17th ed.) Citation

Gupta, P. K., and D. S. Hira. Problems in Operation Research. New Delhi: Sultan Chand & Sons, 1994.

MLA (9th ed.) Citation

Gupta, P. K., and D. S. Hira. Problems in Operation Research. Sultan Chand & Sons, 1994.