1. Beam G. (1988). Clipper dBASE compiler applications . BPB Publications Delhi India.
2. Briggs D. W and Chatfield B. V. (1987). “Integrated highway information systems.” Synthesis of Highway Practice 133 . National Cooperative Highway Research Program Transportation Research Board Washington D.C.
3. Date C. J. (1986). An introduction to database systems Vol. I. Addison‐Wesley Reading Mass.
4. dBASE IV—Language reference . (1988). Ashton‐Tate Torrance Calif.
5. dBASE tools for C—The graphics library . (1986). J. T. Cooper & Company Ashton‐Tate Torrance Calif.