Judd, J. W. Volcanoes: What They are and What They Teach.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJudd, John W. Volcanoes: What They Are and What They Teach.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJudd, John W. Volcanoes: What They Are and What They Teach.
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