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Capitalization rules can depend on what citation/paper formatting style you are using. Below are capitalization best practices for MLA format (8th ed.), APA format, and Chicago/Turabian style.

• MLA 8 – Capitalization Rules
  • Title case: Capitalize the first word in the sentence, last word, and principal words in titles and subtitles, including those with a hyphen. Use this rule for titles of books and articles cited in the text.
  • Sentence case: Capitalize the first word in the sentence, the first word after a colon, and any proper nouns in a title. Use this rule for titles of non-English works.
  • Do NOT capitalize the following words, unless they begin a title or follow a colon:
    • Articles, such as “a, an, the.”
    • Prepositions, such as “against, between, in, of, to.”
    • Conjunctions, such as “and, but, for, or.”
• APA format – Capitalization Rules
  • Title case is used for the following types of sources in APA style: titles of sources when they are in the body of the work, titles of tests, and titles of periodicals that you would also italicize.
  • Sentence case is used for reference list entries.
• Chicago/Turabian – Capitalization Rules
  • Capitalize proper nouns
  • The full names of legislative bodies are capitalized
  • Titles of works should be capitalized based on headline-style capitalization rules, which are:
    • Capitalize all major words in a title or subtitle
    • Do NOT capitalize “a, an, or the” unless they are the first word in the title
    • Do NOT capitalize “and, but, for, nor, or, to, as.”
    • Proper names are capitalized
    • When listing periodicals in the text, do not capitalize the the leading “the,” even if it is part of the title (i.e. the New York Times).