Isselstein, K. H. (1965). Ancient cataclysms which changed earth's surface. Health Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIsselstein, Karl H. Ancient Cataclysms Which Changed Earth's Surface. Mokelumne Hill, Calif.: Health Research, 1965.
एमएलए (8वां संस्करण) प्रशस्ति पत्रIsselstein, Karl H. Ancient Cataclysms Which Changed Earth's Surface. Health Research, 1965.
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