This relates to unpublished written or verbal communication and you should obtain permission from the author of the communication before using.
The templates below show how references are constructed.
Author. … (year) … Personal Communication. … (Identify where it is if you have included it)
Bloggs, J. (2021) Personal communication.
Note: If you can include a copy of the communication in an appendix, then the reference can include the appendix.
Bloggs, J. (2021) Private communication, (Appendix 4).
Note: If the communication was by email, then include the title and date of the email.
Bloggs, J. (2021) Campaign: Noise and unruly behaviour in classrooms, Email to S Smith, 14 March.