Based on the 1998 authoritative print edition, this encyclopedia features over 2,000 signed articles across the breadth of the discipline by international experts. Each year new or revised entries are added. The 10 volume print edition is available in Reference at both Ireland and OSF Libraries. Limited to 4 simultaneous users.
Contains many extended articles on a range of topics in philosophy from classical times to the modern day. Links to relevant sites are included in the articles.
Phil Papers is a comprehensive directory of online philosophical articles and books by academic philosophers. It monitors journals in many areas of philosophy, as well as archives and personal pages. Phil Papers also accept articles directly from users, who can provide links or upload copies. Some features require that you sign in first, but creating an account is easy and free.
Thomas Aquinas
Other Guides
Many fields have their own distinct philosophies and topics:
The Blackwell dictionary of Western philosophy
Historical dictionary of medieval philosophy and theology
Historical dictionary of ancient Greek philosophy by 
