Starting at the library home page:
http://library.buffalostate.edu/home
Use the search box to type the title (author, ISBN, etc) of your book in the search box on the main page.
Pro Tip: Put titles in quotes to increase the searches accuracy. The quotes will force the search to treat the title as a complete phrase.
Once you have a search result, you may need to choose "Book / eBook" Content Type to limit your results to book format only (Choose from the side bar or filter menu).