Bible dictionaries are organized alphabetically like encyclopedias. They have articles on thousands of topics. Useful sources are often listed at the end of articles.
Concordances list every word in the Bible in context.
Commentaries interpret passages in Scripture verse by verse and are arranged in Biblical order.
RefWorks is a web-based bibliography and database manager that allows you to create your own personal database by importing references from text files or online databases. You can use these references in writing papers and automatically format the paper and the bibliography.