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According to The Bluebook, when citing a U.S. Supreme Court case, you must cite to the official reporter, the United States Reports, if the case is published therein, or to the Supreme Court Reporter, if the case has not yet been published in the United States Reports. A citation to a case in the United States Reports includes the following five elements:
Name of the case (underlined or italicized and abbreviated according to Rule 10.2)