It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
University Library, University of Illinois at Urbana-Champaign
Reference sources are a great starting point for background information about a topic. The Social Sciences, Health, and Education Library, as well as other libraries at Illinois, have general AND subject specific reference books.