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For interviews, letters, emails, and other person-to-person communication, cite the communicator's name, the date of the communication, and this.
What is 'personal communication?'
Example: K. M. Ingraham (personal communication, October 5, 2013) stated that she found her career as an educational psychologist intellectually stimulating as well as emotionally fulfilling.
Example: Harvey Kail, interview by Laurie A. Pinkert, March 15, 2009, interview 45B, transcript.