Armstead, H. C. H. (1983). Geothermal energy: Its past, present, and future contributions to the energy needs of man (2nd ed.). E. & F.N. Spon.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रArmstead, H. Christopher H. Geothermal Energy: Its Past, Present, and Future Contributions to the Energy Needs of Man. 2nd ed. London: E. & F.N. Spon, 1983.
एमएलए (9वां संस्करण) प्रशस्ति पत्रArmstead, H. Christopher H. Geothermal Energy: Its Past, Present, and Future Contributions to the Energy Needs of Man. 2nd ed. E. & F.N. Spon, 1983.
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