Lumen Learning
Lumen: Annotated List of Useful Databases
This is an annotated list of useful databases including the difference between search engines and databases and between databases and catalogs, broad-based databases, source-type databases, and subject-type databases.
Other
Concordia University: How to Find Articles
While this site focuses on the resources available in the Concordia Library, it also gives clear information about what indexes and abstracts are, and how and why a student should use them. The general information is helpful, regardless...