Different kinds of reference styles
Documentary note styles
In documentary note styles (documentary-note citation systems), references are given in footnotesor endnotes. The notes are indicated by digits, which then recur with the full reference at the bottom of the page (footnote) or after the text (endnote). The digit, in superscript, is usually placed after the full stop ending the sentence to which the reference belongs. Oxford, Chicago, and MHRA are documentary note reference styles.