Subject encyclopedias and dictionaries provide brief overviews of ideas, people, and culture They are a quick way to find out the basic facts and current points of debate. Handbooks and companions provide longer, essay-length treatments of broader issues. They also tend to include more critical commentary.
When using an article in an encyclopedia or handbook, always check the bibliography for further reading at the end of the article. It will provide a selective list of the books, articles, and, sometimes, primary sources.