A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007

Referencing notes in text
Notes-bibliography style: the basic form
Part II. Source Citation

Whenever you refer to or otherwise use material from a source, you must insert into your text a superscript number that directs your reader to a note that gives bibliographical information about that source. For most quotations, put the number immediately following, whether the quotation is run into the text or set off as a block quotation (see 25.2). For some quotations and for general citations, put reference numbers at the end of a sentence or clause, after the terminal punctuation mark, quotation mark, or closing parenthesis.

Magic was a staple of the Kinahan charm.¹

“This,” wrote George Templeton Strong, “is what our tailors can do.”²

(In an earlier book he had said quite the opposite.)³

If, however, the note refers to material before a dash, put the reference number before the dash:

The bias surfaced in the Shotwell series⁴—though not obviously.

Do not include more than one reference number at the same location (such as ^{5, 6}). Instead, use one number and include all citations or comments in a single note (see 16.3.5).

For aesthetic reasons, do not put note numbers inside or at the end of a title, subtitle, or subhead. If your note applies to the entire chapter, omit the number and put an unnumbered footnote on the first page, before any numbered notes. If a note applies to a section following a subhead, put the reference number after the first sentence in the section.