Hillier, F. S., & Lieberman, G. J. (1994). Operations research (2d ed.). Holden-Day.

Hillier, Frederick S., and Gerald J. Lieberman. Operations Research. 2d ed. San Francisco: Holden-Day, 1994.

Hillier, Frederick S., and Gerald J. Lieberman. Operations Research. 2d ed. Holden-Day, 1994.