Personal communications, including face-to-face, telephone, letters, email or text messages, direct messages through social media, are not included in the bibliography.
Cite in notes as shown below.
1. John Doe, e-mail message to author, Feb. 25, 2016.
2. Facebook direct message to author, May 1, 2017.
3. Phillip Nash, WhatsApp message to author, Sept. 9, 2017.