1. J. D. Wiest and F. K. Levy, A Management Guide to PERT/CPM with GERT/PDM/DCPM and Other Networks, 2nd ed., Prentice-Hall Englewood Cliffs, NY, (1977).
2. S. C. Zan and I. L. Tsou, Mathematic Model, Central Publish Co., Taipei, R.O.C., (1998).
3. J. J. Moder, C. R. Phillips, and E. W., Davis, Project Management with CPM, PERT and Precedence Diagramming, 3rd ed., Van Nostrand Reinhold, NY, (1983).
4. E. G. Frankel, Project Management in Engineering Services and Development, Butterworth & Co., Ltd, London, (1990).
5. W. L. Liu, Production Management, Technology Publish Co., Taipei, R.O.C., (1985).