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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, not footnotes or endnotes.
Guides:
Examples:
APA (American Psychological Association) Style is used in psychology, social sciences, and the sciences.
Please note: APA updated its citation style in January 2020 to APA 7th edition.
Guides:
Examples