APA-viite (7. p.)

Siewers, A. K. The green otherworlds of early medieval literature: Alfred K. Siewers. The Cambridge companion to literature and the environment.(2014).

Chicago-viite (17. p.)

Siewers, Alfred K. "The Green Otherworlds of Early Medieval Literature: Alfred K. Siewers." The Cambridge Companion to Literature and the Environment.(2014) .

MLA-viite (8. p.)

Siewers, 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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