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You'll likely find a combination of scholarly and popular sources that talk about the film you are researching. To find scholarly research articles, you will want to look in academic databases. Film history is also documented online by a variety of reputable sources. Be sure to use a combination of sources for your project!
Reviews of many films. Search for your film and scroll down to the Metascore. Look at the Critic Reviews for high-quality movie reviews. Make sure to read the full reviews, not just the small previews.
Reviews, commentary, and a glossary from Roger Ebert's years as a movie reviewer.
Academic Databases with Film Criticism
Each of these three databases will have scholarly research articles about specific films. Click open any of the databases and search for the title of the film you are researching in the main search box. You will see options on the left to narrow your search results further.
These books tell you information about reputable reviews for old films [1882-1985] (who wrote them, what publication they wrote them for, and the date they published them). You can use this information to find the reviews themselves.