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Karl Mannheim, Ideology and Utopia, 1936.

Gordon Leff, Paris and Oxford Universities in the Thirteenth and Fourteenth Centuries; An Institutional and Intellectual History, Huntington, N.Y., RE. Krieger Pub. Co., 1975.

Medieval Thought; St. Augustine to Ockham, 1958.

William of Ockham, The Metamorphosis of Scholastic Discourse, 1975.