McKenzie, G. D., & Utgard, R. O. Man and his physical environment: Readings in environmental geology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcKenzie, Garry D., और Russell O. Utgard. Man and His Physical Environment: Readings in Environmental Geology.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMcKenzie, Garry D., और Russell O. Utgard. Man and His Physical Environment: Readings in Environmental Geology.
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