All sources should be cited in a bibliography or reference list and in the text or footnotes of a research paper.
Citations give credit to the the author as well as enable other researchers (or your instructor) to locate the cited item.
Citation styles provide rules for writing and formatting in-text citations (i.e., parenthetical citations, footnotes, or endnotes) and source lists (e.g., bibliography, works cited). These styles also provide guidance on how to format the text of the paper (including use of graphs, charts, and images) and writing conventions for the field.
Your instructor may require the use of a specific style or allow students to choose. Either way, what's important is that you use the style consistently throughout your paper.
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