Burke. Land Snails and Slugs of the Pacific Northwest. Oregon State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBurke. Land Snails and Slugs of the Pacific Northwest. Oregon State University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBurke. Land Snails and Slugs of the Pacific Northwest. Oregon State University Press.
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