Παραπομπή APA

Tiwari, N. K. . .. (2009). Operations research. PHI Learning Pvt. Ltd..

Παραπομπή Chicago Style

Tiwari, N K. Operations Research. New Delhi: PHI Learning Pvt. Ltd., 2009.

Παραπομπή MLA

Tiwari, N K. Operations Research. PHI Learning Pvt. Ltd., 2009.