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Chicago Manual of Style: Secondary Sources

Citations from Secondary Sources

Chicago Manual of Style discourages citing a source from a secondary source (quoted in...). If the original source is unavailable, both the original and secondary source must be listed.

Example

John Smith, "Climate Change and Ethics," Virtue Ethics 27 (January 2021): 37, quoted in Gianna Costello, The Way Things Change (New York: Oxford, 2018), 78.