Capitalization RulesRule 8.
Always capitalize the first and last words of titles of publications regardless of their parts of speech. Capitalize other words within titles, including the short verb forms Is, Are, and Be.
Exception: Do not capitalize little words within titles such as a, an, the, but, as, if, and, or, nor, or prepositions, regardless of their length.
Examples:
- The Day of the Jackal
- What Color Is Your Parachute?
- A Tale of Two Cities
This is specifically for titles of publications, but I would assume it would be the same for the title of any proper noun. Personal note ... I didn't know about the Is/Are/Be!