MLA Handbook by The Modern Language Association of America
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Publication Date: 2021
Online and print. Relied on by generations of writers, the MLA Handbook is published by the Modern Language Association and is the only official, authorized book on MLA style.
The Chicago Manual is a comprehensive style manual used throughout the U.S. publishing world, perhaps more comprehensive than most college students need, but containing much useful advice on matters of punctuation, capitalization, and word choice as well as on the documentation of sources.
Resources "that address questions about using and documenting sources; avoiding plagiarism; writing in the disciplines; grammar, style, and punctuation; and other aspects of writing."
Citation Manager
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MLA Handbook by 
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The Chicago Manual of Style