It is cited correctly in case that we only have one work by Winston mentioned in our bibliography page. This way, we could turn to it and see the paper or the book and find it and on page 12 we would see the quote. If there were more papers by Winston used then you would also have to add the name of the paper or the book in the brackets.
The citation is correct if there's only one work by Winston in the bibliography, as it includes a page reference. If there are multiple works, you need to include the title alongside the author's name. Always ensure citations are clearly linked to corresponding entries in the bibliography.
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