| 1 | [1] Antenucci, J.C., Brown, K., Croswell, P.L., Kevany, M.J., Archer, H., (1991). “Geographic Information Technology – A Guide To The Technology”, Van Nostrand Reinhold New York. |
| 2 | [2] Wilson, J. P., Fotheringham, A. S. (2010). The Handbook of Geographic Information Science, Blackwell Publishing, USA. |