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Chicago Manual of Style - South Bend-Elkhart: E. Secondary Sources

Secondary Sources (p. 764)

Sometimes an author will quote work someone else has done, but you are unable to track down the original source. In this case, both the original and the secondary source must be listed in the note and the bibliography. 

   
If, for example, you were reading a book and the author of the book (in the example below, that would be Sarah Gwyneth Ross) made reference to the work done by another author (in the example below, that would be Astrik L. Gabriel), you would refer to the work as per the layout below.
 
General Format 
 
       Full Note: 

            1. Author First Name/Initial Surname [original author], Title (Place of
      Publication: Publisher, Year), page number, quoted in Author First Name/Initial
      Surname [the author of the book that refers to the thoughts/ideas of the
      other author]), Title (Place of Publication: Publisher, Year), page #.
 
      Concise Note: 

            2. Author Surname [original author], Title, page #.
 
      Bibliography:

      Author Surname, First Name/Initial [original author]. Title. Place of Publication:
            Publisher, Year. Quoted in Author First Name/Initial Surname [the author
            of the book that refers to the thoughts/ideas of the other author]. Title.
            Place of Publication: Publisher, Year, page #.
  
Example
 
      Full Note:

            1. Astrik L. Gabriel, "The Educational Ideas of Christine de Pisan," Journal of
      the History of Ideas 16, no. 1 (1995): 3-21, quoted in Sarah Gwyneth Ross, The
      Birth of Feminism: Women as Intellect in Renaissance Italy and England (Cambridge:
      Harvard University Press, 2009), 23.
     
 
      Concise Note:

            2. Gabriel, "The Educational Ideas," 3-21.
   
      Bibliography:

      Gabriel, Astrik L.. "The Educational Ideas of Christine de Pisan." Culture and
            Imperialism. Journal of the History of Ideas 16, no. 1 (1995). Quoted in
            Sarah Gwyneth Ross. The Birth of Feminism: Women as Intellect in
            Renaissance Italy and England. Cambridge: Harvard University Press,
            2009, 23.