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The Bluebook offers guidance for citations in footnotes ("below-the-line" text). For guidance about grammar and style, particularly for "above-the-line" text, you should refer to these style manuals:
Covers punctuation, capitalization, grammar, prose style, and clarity in general. Written in the style of a restatement, with the black-letter rules followed by comments and illustrations.
For guidance regarding spelling in the text of Articles, Notes, or Comments, you should refer to these dictionaries, or another dictionary your journal selects, along with any internal style sheets your journal develops.