Παραπομπή APA

Gupta, P., & Hira, D. (1979). Operations research: An introduction. S chand.

Παραπομπή Chicago Style

Gupta, P.K, και D.S Hira. Operations Research: An Introduction. New Delhi: S chand, 1979.

Παραπομπή MLA

Gupta, P.K, και D.S Hira. Operations Research: An Introduction. S chand, 1979.