Just like print books, the library catalog linked above can help you access ebooks. In the search results, ebooks will have a [electronic resource] tag.
When you click on the catalog record for an ebook, it will have no call number (because it has no physical shelf location). Instead, it will have a hyperlink that says, "click here for electronic book." Simply click the link, and you can read (and print from, if you like) the ebook on your computer screen.
The library catalog linked above can also help you access print books. Books in the library are organized via the Library of Congress Classification system. In the search results, books will have a call number derived from this classification system -- in the example below, P94.6 .L845 2012:
Here is an explanation of how to read a call number:
Graphic from California State University, Chico
