Chicago Manual of Style Online - 14.112: Citing AI-generated Content
"Authors who have relied on content generated by a chatbot or similar AI tool must make it clear how the tool has been used (either in the text or in a preface or the like). Any specific content, whether quoted or paraphrased, should be cited where it occurs, either in the text or in a note." Instructions and examples are provided for in-text citations, notes, and bibliographies or reference lists.