Final answer:
A footnote in a document is identified by a reference marker in superscript format, used to provide additional information that doesn't fit into the main text. In electronic documents, these are often hyperlinked. The MLA style is commonly used for formatting and citing sources in academic writing.
Step-by-step explanation:
When a footnote is inserted into a document, a reference marker is indeed added. This marker is often a number or a letter in superscript format. These superscript numbers or letters are typically placed at the end of a sentence or a clause, directing the reader to the bottom of the page or to the endnotes section, depending on the formatting style used. Footnotes are used by writers to include additional information that does not fit seamlessly into the main text. This information can include explanations, comments, or citations of sources.
Within electronic documents, such as PDFs, these reference markers are often hyperlinked, allowing readers to easily navigate to the additional information and then back to the main text. In academic writing, the Modern Language Association's (MLA) guidelines provide specific formatting instructions for footnotes and endnotes, as well as for the comprehensive list of works cited that should appear at the end of the document. All sources mentioned in notes should also be included in this works-cited list to maintain consistency and credit all referenced materials properly.
In-text citations and bibliography entries usually feature the author's name, the title of the work, page numbers, and other relevant publication details as needed.