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A person who collaborates with one or more others to produce a work in which all those who collaborate perform the same function. The parts written or produced by each person are not always indicated, nor are they necessarily distinguishable. The names of joint authors are usually listed on the title page of a book, or at the beginning of a journal article. Style manuals vary on the number of joint authors whose names may be included in a citation. Synonymous with coauthor.