Rai G.D. (2020). Non-Conventional Energy Sources (6th.). Khanna Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRai G.D. Non-Conventional Energy Sources. 6th. Delhi: Khanna Publishers, 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRai G.D. Non-Conventional Energy Sources. 6th. Khanna Publishers, 2020.
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