2003. Great general information resource. This 15 volume collection has 12,000 entries on theology, philosophy, history, literary figures, saints, musicians and much more.
2010. Focus on the Church in Modern History, particularly WWII and after. It also includes about 200 entries on the men and women who have been beatified or canonized since 2003.
Focus on the pontificate of John Paul II and includes thematic essays presenting the man and his work. Headings include: The Papacy of John Paul II; Church Documents; People and Places; Institutions and Events, Saints and Blessed.
A digital library, from Princeton University, of over 80,000 resources on theology and religion. It consists mainly of public domain books but also includes periodicals, audio recordings, and other formats.
Bible commentary (12-volume set) required by many professors. You must know the specific passage (book name, chapter, and verse) where your term appears. If you don't know the specific passage, use a concordance (see below).
Single-volume Bible commentary (i.e., short commentary on each book of the Bible). You must know the specific passage (book name, chapter, and verse) where your term appears. If you don't know the specific passage, use a concordance (see below).
Alphabetical list of almost every word used in the Bible, with references to where that word appears. Use a concordance to help you find the book/chapter/verse where your term appears, before using a commentary.
Sample Reference Books
The New Interpreter's Dictionary of the Bible - A-C