Não informado. (1968). Bulletin of the Geological Society of Finland. Geological Society of Finland.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Geological Society of Finland. Helsinki: Geological Society of Finland, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Geological Society of Finland. Geological Society of Finland, 1968.
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