How do you cite if the sentence is cited?

A sentence in a book or article with a citation is the author's paraphrase or quote of another author's work. This is considered a "secondary source," and is discouraged unless the original work is no longer available. If you still want to cite it, use the format specified by your citation style to cite secondary sources. In most styles, provide a full citation to the work you used in your references or Works Cited at the end of your paper. When you mention the passage in your paper, include the original author's name in your text. Add the words "cited in" or "quoted in" to your in-text citation.