Developed by the Modern Language Association, MLA style is typically used to format to cite sources in the humanities (e.g. English, Philosophy, Languages).
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MLA Handbook
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APA (American Psychological Association) Style is used to format and cite sources in psychology, social sciences, and some sciences.
Please note: APA updated its citation style in January 2020 to APA 7th edition.
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Examples
Publication Manual of the American Psychological Association
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Chicago Style is often used for history, art history, political science, or other papers requiring footnotes.
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Chicago Style author-date system is often used for physical, natural, and social sciences. It uses parenthetical notes in the text of the paper rather than footnotes or endnotes.
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