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When you refer to someone’s work in your essay, you need to include an in-text citation. This is normally the surname(s) of the author(s) and the year their work was published. The citation normally comes at the end of a sentence in brackets:
Example: …although other authors have denied this(Hartley, 2019).
Or, if you include the author’s name as part of the sentence, put the year of publication immediately after in brackets: