If you are on campus, you can come in, browse the shelves, and borrow books from the library using your student ID.
When searching Library Search, you can use the search tools on the left hand menu to narrow your search down to books and eBooks. Simply tick the box next to books and you can allow (or disallow - see the red icon on the right) any resource types you like!
If you are a distance student, you can borrow books by accessing the CDU distance library services. EBooks can be accessed through Library Search. More information on eBooks can be found in the eBooks LibGuide.
Like with most resources, there are advantages and disadvantages to using books as resources. Knowing what these are, allows you to decide if a source is useful or not.