Your textbook is a great place to find out more about a topic. Check your text for a list of further reading. Encyclopedias can also be used to find background information on a topic, and dictionaries are useful for finding definitions of terms. Here is a selection of useful reference materials both online and in print.
A selection of books on feminist theory. For more, search SuperSearch using keywords that describe your theory or theorist (e.g. intersectionality, bell hooks, etc.).