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Briggs, Katharine. An Encyclopedia of Fairies: Hobgoblins, Brownies, Bogies, and Other Supernatural Creatures. New York: Pantheon Books, 1976.
Gervase of Tilbury. Otia Imperialia: Recreation for an Emperor. Translated by S. E. Banks and J. W. Binns. Oxford: Oxford University Press, 2002.
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Clark, John. “The Green Children of Woolpit.” Folklore 119, no. 2 (2008): 153–168.
Jones, Gwyn. A History of the Vikings. Oxford: Oxford University Press, 1968. (context on migration and northern European movement)
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