Hillier, F. S., & Lieberman, G. J. (1967). Introduction to operations research (8th ed.). Holden-Day.

Hillier, Frederick S., and Gerald J. Lieberman. Introduction to Operations Research. 8th ed. San Francisco: Holden-Day, 1967.

Hillier, Frederick S., and Gerald J. Lieberman. Introduction to Operations Research. 8th ed. Holden-Day, 1967.