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From Debatepedia

According to Discovering the World through Debate, "authority" may refer to "An argument that supports a claim with the opinion of experts in the field" (246).

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"Works Cited"

Trapp, Robert, et al. Discovering the World through Debate: A Practical Guide to Educational Debate for Debaters, Coaches, and Judges. Third Edition. New York: IDEA Press Books, 2005.