.Hillier, F. S., & .Lieberman, G. J. (2010). Introduction to operations research (9th ed.). McGraw-Hill Higher Education.

.Hillier, Frederick S., and Gerald J. .Lieberman. Introduction to Operations Research. 9th ed. New York: McGraw-Hill Higher Education, 2010.

.Hillier, Frederick S., and Gerald J. .Lieberman. Introduction to Operations Research. 9th ed. McGraw-Hill Higher Education, 2010.