In the notes-bibliography system, each in-text reference is denoted by a number that corresponds to a footnote.

• When it's time to cite a source within the text of your paper, you'll insert a footnote outside of the period or other punctuation using your word processor.
• A superscript 1 will appear after the punctuation mark, and you will be taken to the footer of the page which will also show a 1. The superscript 1 in the text alerts your reader to look for the 1 on the bottom of the page for more information.

From Purdue OWL's "CMOS NB Sample Paper."

• In the footer, add a period after the number, and create your footnote.
  • The first line of a footnote is indented .5” from the left.
  • Subsequent lines of a footnote are flush left.
  • Footnotes are single-spaced within a note.
  • Double-space between footnotes.
• Each subsequent note within your text will follow in numerical order throughout your paper. Even if you insert a note in between notes, for example, the software you are using will adjust.

From Purdue OWL's "CMOS NB Sample Paper."

In the notes-bibliography system, the page at the end of your paper where you will list all of your citations should be titled Bibliography.

• Bibliographies should be organized in alphabetical order by the first letter in the first word of each entry.
• Subsequent lines of an entry have a hanging indent.
• Write out the names of the first 3 authors.
• If there are 4 to 10 authors, write out the names of each author in the bibliography entry, but use First Author Name et al. in the footnote.
• Use DOIs instead of URLs if possible.
• Make DOIs active.

From Purdue OWL's "CMOS NB Sample Paper."