To write an informed paper, you'll need to find film critiques and criticism from reputable primary sources and professional film critics. These articles are sometimes published in literary, historical, or film study magazines and journals. All of which can be found using the library's ONE SEARCH tool. A few appropriate publications include: The Atlantic, The New Yorker, American Cinematographer, The New York Times, RogerEbert.com, Film Comment, Cineaste and others.
Watch these videos and perform your own search, following similar steps. In doing so, you will discover authoritative articles and reputable reviews on your chosen film.
After you gather your sources and review them, don't forget make an outline. Watch the video to learn how to do it well.