Janszen, E. Moving beyond conventional energy. Financial executive.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJanszen, Eric. "Moving Beyond Conventional Energy." Financial Executive .
एमएलए (9वां संस्करण) प्रशस्ति पत्रJanszen, Eric. "Moving Beyond Conventional Energy." Financial Executive, .
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