(Author’s last name Year received, pers. comm., Day Month)
“This is correct to the best of knowledge” (Brown 2012, pers. comm., 3 July)
or
Professor Shickle (2008 pers. comm., 8 July) verified in an interview that the contents of the email were correct
Author’s last name, Author’s initials Year published, format, Day Month.
Personal communications can take a number of forms and are not normally available for consultation except under special circumstances. For this reason, they are not usually included in the reference list.
Brown, B 2012, email, 3 July.
Shickle, S 2008, interview, 24 November.