Cite published interviews with the name of the person interviewed, the conductor of the interview, the publisher and the date. Broadcast interviews are also considered published and should be cited with the network name or radio station. For example: Darren Criss, interview by Ryan Seacrest, Morning Show, 103.3 KISS FM, April 3, 2011.
Cite unpublished interviews (not email interviews) with the interviewee, the interviewer, the date and the medium. For example: James Joyce, interview by Henry D. Thoreau, October 11, 1983, transcript.
Cite email interviews as a personal communication with the name, what the email was and the date. For example: Bruce Wayne, email message to author, June 27, 2011. The author refers to the person conducting the interview, in this case, the author of the research paper.