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Ward, M. (2008-03-01).  Primum Mobile. In Planet Narnia: The Seven Heavens in the Imagination of C. S. Lewis. : Oxford University Press. Retrieved 16 Sep. 2019, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195313871.001.0001/acprof-9780195313871-chapter-10.