These materials can provide a source of background information as well as additional readings. They can also be a good place to start when you are beginning research in an area you are unfamiliar with.
Searchable database of several hundred subject encyclopedias and other reference works across all subject areas, but with particular strengths in the social sciences and humanities. It includes a number of major reference works, and is Northwestern’s largest single collection of reference materials. A good source for authoritative background information.