Rafferty, K. A Guide to On-Line Geological Information and Publications for Use in GSHP Site Characterization. (Geo-Heat Center, Oregon Institute of Geology, 2000). at <http://geoheat.oit.edu/otl/guidegshp.pdf>

An Information Survival Kit for the prospective geothermal heat pump owner. (Geo-Heat Center, Oregon Institute of Technology, 2001). at <http://geoheat.oit.edu/ghp/survival.pdf>

Geothermal Heat Pump Information . at <http://energy.gov/eere/geothermal/geothermal-energy-us-department-energy>

Geothermal Heating and Cooling Technologies. at <http://www2.epa.gov/rhc/geothermal-heating-and-cooling-technologies#Ground>

MassDEP Geothermal Integration Fact Sheet. at <http://www.mass.gov/eea/agencies/massdep/water/reports/geothermal-integration.html>

New England Geothermal Professional Association. at <http://www.negpa.org/>

Outside the Loop . at <http://geoheat.oit.edu/otl/index.htm>