Siewers, A. K. The green otherworlds of early medieval literature: Alfred K. Siewers. The Cambridge companion to literature and the environment.(2014).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSiewers, Alfred K. "The Green Otherworlds of Early Medieval Literature: Alfred K. Siewers." The Cambridge Companion to Literature and the Environment.(2014) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रSiewers, Alfred K. "The Green Otherworlds of Early Medieval Literature: Alfred K. Siewers." The Cambridge Companion to Literature and the Environment.(2014), .
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