Should an article at the start of a subtitle be capitalized?

Note: This post relates to content in the eighth edition of the MLA Handbook. For up-to-date guidance, see the ninth edition of the MLA Handbook.

Yes, capitalize articles (a, an, the) at the start of titles and subtitles in English:

The Sisters: The Saga of the Mitford Family

A Sense of Things: The Object Matter of American Literature

Also capitalize articles at the start of titles and subtitles in languages using the Latin alphabet:

Los pueblos: La Andalucía trágica y otros artículos