Simply click on the Search button without entering a search.
On the next page, scroll to the bottom corner to the heading for Location and check off the box for AU Library Catalog, ELECTRONIC COLLECTION. Then type your search terms in the search boxes at the top of the page and click SEARCH.
On the next page of results, use the left sidebar to Refine Search.
Go to Source Type.
If you don't see eBooks listed as a Source Type, click on Show More.
Check eBooks and then click Update.