Chicago style Footnote is a footnote-bibliography system used for citing and referencing information in assignments and publications. When using direct es in your assignment, place them between double marks with the footnote number at the end of the e. The Chicago Manual of Style refers to a "key term", which should be italicized on its first occurrence only. This could apply to the investigation file. Perhaps more useful is the Oxford Guide to Style which says: "Use ation marks to surround an unfamiliar word or phrase, or to be used in a technical sense." The effect is similar to this: Since footnotes are most often used by Saint Paul University students, this guide focuses on this particular style of footnote. When a superscript number is at the end of a sentence, it is placed after the final punctuation mark. When a superscript number is at the end of ae, it is placed after the final ation,