You will run across ebooks wherever you do research.
In CLICsearch, ebooks will have the link "Online Access" below the title information. Below that will be the list of where that ebook is available.
In this example we have 2 copies, one in Business Expert Press and the other available in Ebook Central Academic Complete. It's your choice which database you want to use. If you know you already have an account set up at Ebook Central, you may choose to use that for ease.
If the book had a limited number of users, CLICsearch would indicate that: