In both titles and subtitles of works mentioned in the text of a paper, major words such as nouns, pronouns, verbs, adjectives, and adverbs should be capitalized. Minor words such as articles, prepositions, and coordinating conjunctions are not capitalized unless they are the first or last word of a title or subtitle. (In APA style, also capitalize all words of four or more letters. See 62a.)
Capitalize the second part of a hyphenated term in a title if it is a major word but not if it is a minor word. Capitalize chapter titles and the titles of other major divisions of a work following the same guidelines used for titles of complete works.
Seizing the Enigma: The Race to Break the German U-Boat Codes
A River Runs through It
“I Want to Hold Your Hand”
The Canadian Green Page
To see why some of the titles in the list are italicized and some are put in quotation marks, see 42a and 37c.
Titles of works are handled differently in the APA reference list. See “Preparing the list of references” in 62a.