Look around the website! Here are a few important parts, also linked on the homepage:
For all your source-citing needs, your librarian recommends MyBib. It's a free site that walks you through creating a citation. It also prepares a properly formatted Works Cited page for you to copy and paste or download!
The library's website also has its own brief guide to creating citations in both MLA and APA formats, including examples of commonly cited sources.