1. Dominion Power 2008 Environmental Performance Report: CO 2 Emissions www.dom.com/about/environment/report/co2-emissions.jsp
2. Esri 2008 ArcGIS Desktop 9.2 Evaluation Software http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?topicname=types_of_geodatabases
3. Life-Cycle Energy Analysis of a Water Distribution System;Filion;Jour. Infrastructure Systems---ASCE,2004