From Citizendium, the Citizens' Compendium
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- Barfield, Owen (1973). Metaphor. Poets.org. Academy of American Poets.. Retrieved on 2009-03-30. Excerpt from Poetic Diction: A Study in Meaning by Owen Barfield. Copyright © 1973 by Owen Barfield. Reprinted by permission of Wesleyan University of Press.
- Geary, James (July 2009). Metaphorically Speaking. TED Talks. TED Conferences. Retrieved on 2009-12-19.
- The Mind is a Metaphor Blog. "Treated herein are select metaphors of mind from British eighteenth-century literature."