Hi, Dan,

I have checked a couple of style guides and the IRB sites at UNC and Duke and haven't come across this info either... I have consulted with several other librarians, all of whom wonder why you need to cite these interviews at all, considering that you wish to keep the interviewees confidential and that you are the one who collected the data. One librarian's rationale is as follows:

I tell students that if they are reporting their own research -- they conducted the interview themselves -- then there's no citation required. I reason that the citation is used to give credit for someone else's intellectual property or to direct the reader to the original material. If the student collected the data, then neither of these reasons for citation apply.

I agree with her...what are your thoughts, though? I have a feeling that there may be a bit more to your question... Feel free to contact me directly at emily.daly@duke.edu, if you like.