1. Erisen B, et al. Geothermal resources of Turkey. Turkish Mineral Research and Exploration Foundation (MTA) Technical Report, Ankara, 1996
2. Utilization of geothermal energy with an emphasis on heat pumps;Niess;GRC Trans,1979
3. Geothermal system for school;Dinse;ASHRAE J,1998
4. Direct use of geothermal in Washington State past, present, and future;Bloomquist;GRC Trans,1994
5. Ellis PF, Conover MF. Material selection guidelines for geothermal energy utilization systems. Radian Corp., Austin, TX, 1981