1. Andrews, S. K. and D. W. Tilton (1993) “How multimedia and hypermedia are changing the look of maps”, Proceedings, Auto-Carto 11, Minneapolis, pp. 348–366.
2. “Visualization in the earth sciences”;DiBiase;Earth and Mineral Sciences, Bulletin of the College of Earth and Mineral Sciences, PSU,1990
3. “The density dial: a visualization tool for thematic mapping”;Ferreia;GeoInfo Systems,1990
4. Visualization: the Second Computer Revolution;Friedhoff,1989
5. Visualization in Geographical Information Systems;Hearnshaw,1994