1. Water injection management for resource maximization: observation from 25 years at The Geysers, California;Barker,1995
2. CDOGGR, 2008. Annual Report of the State: Oil & Gas supervisor. Division of Oil, Gas, & Geothermal Resources, California, Department of Conservation, Sacramento, California, USA, Publication No. PR06, pp. 249–262.
3. City of Santa Rosa, 2003. Connections – Santa Rosa utilities update. 1 (1), October, 2 pp.
4. County of Lake, 1991. Agreement for TAC Supervision of GeothermEx Reservoir Modeling. Planning Department – Resource Management Division, Lakeport, California, USA, September 10, 1991, 18 pp.
5. An update on The Geysers, November 1994;Geysers Geothermal Association;Geothermal Resources Council Bulletin,1995