Propaganda films, documentaries, and feature films are particularly rich primary source materials for twentieth- and twenty-first-century history.
The Moving Image Archive (part of the Internet Archive) contains interesting older work, including advertisements, newsreels, and propaganda.
Search Primo if you know the title of the film you seek to see if a DVD is available in Collins Library or is available through another SUMMIT library.
If you've identified a Library of Congress Subject Heading that covers your research topic, search by that, then use the facets on the right to limit by material type: films, DVD/video, or media.
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Here's a sampling of films--from different perspectives and different times--that relate to the experience of World War II in Asia.
Google Books contains the scanned full text of millions of books. You'll be able to get the full views for materials now out of copyright (pre-1922); you'll get snippet views for copyrighted materials.