Παραπομπή APA

Gupta & Hira. (1979). Operations research. Sulthan Chand & Co.

Παραπομπή Chicago Style

Gupta και Hira. Operations Research. New Delhi: Sulthan Chand & Co, 1979.

Παραπομπή MLA

Gupta και Hira. Operations Research. Sulthan Chand & Co, 1979.