Theses and dissertations are a great place to see examples of literature reviews (almost every thesis or dissertation will have one) and they are great places to find additional resources for your own literature review.
Phillips Library has copies of theses and dissertations written by our graduates. Simply search your broad topic in the Phillips Library catalog and then limit to AU Dissertations and Theses in the right column under "location."
Phillips Library also has access to ProQuest's Dissertations and Theses database. After clicking the link below make sure you are only searching dissertations and theses by clicking the arrow at the top of the page that says "Searching: 6 databases" and change the search to just the dissertation and theses database.