Routledge Encyclopedia of Philosophy by 
Encyclopedia of Philosophy by Also try typing into a title search in Library Central Advanced Search
Cambridge Companions to Philosophy
(these include 14 different companions in a wide range of Philosophy subjects from Arabic Philosophy to Socrates.)
If you are not an St. Ambrose University user, your local public library may have access to various databases that are subscription based. Call and ask your public library for details.
Have you found the perfect article but don't know if we subscribe to it? Here are some steps you can take.
1. We may have access to the journal in another database. In Library Central under the A-Z link, you'll find the Periodical Holding List. From here, you can check a comprehensive list of databases in which our journals appear.
2. Try searching for the title of the article in Google Scholar. Any research that makes use of taxpayer funding must be eventually released to the public--you might find an openly available copy of your article.
3. We can go to other libraries that subscribe to the journal and have them send us a copy. You can find a direct link to the ClioWeb interface here.