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Titles of articles take initial capitals when they appear as titles in text but not when they appear in a reference list.
In titles and headings, capitalize 2-letter verbs, such as go, do, am, is, be. Note: In infinitives, “to” is not capitalized. Do not capitalize a coordinating conjunction, article, or preposition of 3 or fewer letters, except when it is the first word in the title or subtitle or part of a hyphenated term....