Personal communication, like letters, interviews, phone calls, email and in many cases lectures, should not be included in the bibliography, since the material is often not available to the reader. One way to manage personal communication is to simply refer to the source in the footnote. The citation should include information that clarifies the person’s role, context, form of communication and date. The title of the lecture can be included if one is provided.
For example, see Interviews / personal communication in the menu.