ARMSTEAD, C. H. Geothermal energy its past, present and future contributions to the energy needs of man. E & FN Spon Ltd.
Chicago-referens (17:e uppl.)ARMSTEAD, Christopher H. Geothermal Energy Its Past, Present and Future Contributions to the Energy Needs of Man. E & FN Spon Ltd.
MLA-referens (8:e uppl.)ARMSTEAD, Christopher H. Geothermal Energy Its Past, Present and Future Contributions to the Energy Needs of Man. E & FN Spon Ltd.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.