Answered By: Reference Librarian Last Updated: 2014.Aug.14 Views: 3342
According to the OWL:
If you refer to the title of a source within your paper, capitalize all words that are four letters long or greater within the title of a source: Permanence and Change. Exceptions apply to short words that are verbs, nouns, pronouns, adjectives, and adverbs: Writing New Media, There Is Nothing Left to Lose.
(Note: in your References list, only the first word of a title will be capitalized: Writing new media.)
Use a capital letter for the first word in a subtitle, too.
Let me know if you still have questions.