Não informado. (1967). Quarterly Journal of Engineering Geology. Geological Society of London.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Quarterly Journal of Engineering Geology. London: Geological Society of London, 1967.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Quarterly Journal of Engineering Geology. Geological Society of London, 1967.
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