Footnote/bibliographic referencing styles have information identified by placing a superscript number at the end of the sentence that includes the direct quote or paraphrase. The number refers the reader to a footnote at the bottom of the page, which contains the details of the source. Chicago A is an example of a footnoting style with a bibliography.
Chicago A requires a bibliography arranged alphabetically by family name including all works cited, plus any other works consulted but not cited.
Once you have selected your preferred reference style we recommend you review the General style notes section, to develop your understanding of the requirements of the style.