1. Energy for tomorrow's world,1993
2. Global energy perspectives,1998
3. Energy requirements for the next millennium;Fridleifsson,2000
4. WEA. World energy assessment report, prepared by UNDP, UN–DESA and the World Energy Council. New York: United Nations; 2000.
5. Sekioka M. Japanese geothermal waters through history. In: Cataldi R, Hodgson SF, Lund JW, editors. Stories from a heated earth. Geothermal Resources Council and International Geothermal Association, 1999, 392–405