Morris, May. Remarks on the Prose Romances, especially The House of the Wolfings and The Roots of the Mountains, May Morris, William Morris: Artist, Writer, Socialist, Oxford: Blackwells, 1936, 509-16. [pdf]
Shippey, T. A. "'Goths and Huns: The Rediscovery of the Northern Cultures in the Nineteenth Century," in The Medieval Legacy: A Symposium, ed. Andreas Haarder, et al. Odense: Odense Unversity Press, 1982, 51-69.
Vaninskaya, Anna. "William Morris's Germania: The Roots of Socialism," in William Morris in the 21st Century, eds. Phillippa Bennett and Rosie Miles, New York: Peter Lang, 2010.
B. L. 45,328, ff. 54-58 Drafts, poems from Roots of the Mountains