If this is a formal interview which you held and which is an important contribution to your thesis, your bibliography should include the name of the interviewee, a description of the type of interview, and the place and date: John Q. Smith, taped interview by author, Chicago, Illinois, 20 November 2009 If it is just a single informal quote, however, you can simply add a footnote to the quotation in your text, reading ' John Q. Smith, pers.
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