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https://www-chicagomanualofstyle-org.divinity.idm.oclc.org/book/ed17/part3/ch14/toc.html
Add a footnote each time you refer to the work of another scholar, whether you quote directly, use the work as a source of information, or critically engage with its ideas. When inserting a footnote, add a superscript numeral after the punctuation. The bibliography lists only those sources mentioned in the footnotes.
When following the rule for notes or bibliography entries you should include all the punctuation, italics, and spacing as they are set out here. Note that second and subsequent citations of a work are abbreviated in a specific way, and that ibid. and op.cit. are not used. When preparing a bibliography, sources should be presented on a separate page and listed in alphabetical order by author surname. Sources without an author should be listed before sources with authors.