Personal communications (such as e-mail messages to you), private interviews that you conducted with another person, personal letters, telephone calls, and other material that cannot be retrieved are cited in the text and receive a slightly more elaborate in-text citation. They are not listed in the references

To cite a personal communication, provide first name or initials and last name of the communicator, the type of personal communication, plus as exact a date as possible in the body of your paper.

Jesse Moore (telephone conversation, April 17, 1989) confirmed that the ideas . . .

A. P. Smith also claimed that many of her students had difficulties with APA style (personal communication, November 3, 2002).