Surname, initials of person being interviewed. Year. The position of the person (if applicable). [Nature of interview] (e.g. personal interview, correspondence), day and month, Place.
Example:
Maggs, P.N. 2021. Director, E-Commerce Solutions [Personal interview], 27 September, Midrand.
Sender’s surname, initials. (sender’s e-mail address). Year. Re: Subject of message (in italics). e-mail to recipient (recipient’s e-mail address), day month.
Example:
May, P. (jayp54@hotmail.com). 2019. Re: Outsourcing supply. E-mail to M. Ndlovu (mndlovu@unisa.ac.za), 9 March.