Anselin, L., R.J.G.M. Florax, and S.J. Rey. 2004. Advances in Spatial Econometrics: Methodology, Tools and Applications. Springer: New York, NY. Luc Anselin, Ibnu Syabri, Youngihn Kho (2009) GeoDa: An Introduction to Spatial Data Analysis, Springer. Smith, M. J., Goodchild, M. F., Longley, P. A. (2015). Geospatial Analysis: a Comprehensive Guide to Principles, Techniques and Software Tools, 5th Edition. Troubador Ltd: Leicester, UK.: