Personal communication
Personal communications, including email and text messages and direct messages sent through social media, are usually cited in the text or in a note only; they are rarely included in a bibliography.
In notes
1 Sam Gomez, Facebook direct message to author, August 1, 2024.
ChatGPT and artificial intelligence
The Chicago styles recommends that references to ChatGPT and other similar services are treated the same way as personal communication. Personal communication and text generated by large language models cannot be reproduced or found, and they should therefore not appear in the reference list.
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