Aho, A. V., Hopcroft, J. E., and Ullman, J. D. (1983), Data Structures and Algorithms, Reading, MA: Addison-Wesley.

Burlew, M. M. (1998), SAS Macro Programming Made Easy, Cary, NC: SAS Institute Inc.

Cox, J. F., III and Blackstone, J. H., Jr, eds. (1998), APICS Dictionary, Ninth Edition, Alexandria, VA: APICS.

Landvater, D. V. and Gray, C. D. (1989), MRP II Standard System: A Handbook for Manufacturing Software Survival, New York: John Wiley & Sons.

Plossl, G. (1995), Orlicky’s Material Requirements Planning, Second Edition, New York: McGraw-Hill.