Encyclopedias are a great way to get general information, or the "lay of the land" when you are starting your research. Below are a list of recommended encylopedias available online.
Academic books are a great source for information. Often there are chapters that can be detailed about a specific event, company, or theory. There are also books that may explore a broader topic or theory in great depth.
Try a simple search: (By putting the terms in quotes, it forces the system to look for both words together.)
Once you've run a search, use the "Refine My Results" options on the left side of the page. It's a quick way to drill down to the most useful results without paging through a lot of items you're not really interested in. Options often include limiting by: