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That number correlates with a footnote or endnote. When a source is used in a research paper, a roman numeral is placed at the end of the borrowed information as superscript (it is smaller than the normal line of text and raised). These footnotes and endnotes acknowledge the different sources used in the work. If you’re wondering how to format Chicago in-text citations, Notes and Bibliography formatting requires writers to use footnotes and endnotes. How to Create Footnotes and Endnotes for Chicago Style
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