LionSearch, also called the "FIND" box, is also on the Libraries' home page. You can search here for books, articles, videos, and every other kind of resource the Libraries offer. This is a great way to "cast a wide net" as they say. Once you have a better idea of your topic's background, you can utilize some of the more specialized sources on this guide.
These reference sources can be helpful for looking up background information, such as the history of certain communication theories, and things like that.