In CSE style, interviews and other forms of unpublished communications (i.e. email, letters) are not included in your reference list. Instead they should be referenced parenthetically within the text. Make sure you obtain permission from any third parties before using them in your publication.
(name of third party(first/middle initials, last name), form of communication, month day, year)
running text (R. Monge, e-mail message, September 14, 2013)
running text (V. Latham, personal communication with author, July 1, 2010)