1. Abkowitz, M., Walsh, S., Hauser, E. and Minor, L. (1990). Adaptation of geographic Information systems to highway management.J. Transportation Engineering,116(3): 310–327.
2. Arc View Network Analyst-Optimum Routing, Closest Facility and Service Area Analysis (1996). Environmental Systems Research Institute Inc., California, USA, 74p.
3. Cova, T. (1999). GIS in emergency management. In: Longley, P.A., Goodchild, MR, Maguire, D.J. and Rhind, D.W. (eds.). Geographical Information Systems. John Wiley & Sons Inc, New York,1: 845–858.
4. Ian Heywood, Sarah Cornelius, and Steve Carver (2000). An introduction to Geographical Information Systems. A.W. Longman, Pearson Education Asia, 279p.; Network Analysis, 123–125.
5. Korte, G.B. (1990). The GIS Book (4th Edn). OnWord Press, USA, 414p.