References
Ecotrust. What is GIS? April 18, 2000.
http://www.ecotrust.org/mission/what_is_gis.html
McMullin, Shaun K. Business Applications of Geographic
Information Technologies & GIS. April 17, 2000.
http://students.washington.edu/mcmullin/
Mitchell, Andy. Zeroing In. 1997-1998 Environmental Systems
Research Institute, Inc. Chapter 9: Business.