If you don't want to download the whole ebook, you can download a certain number of pages as PDFs. It's usually around 10% of the whole book. If you need more, just close the browser, and go back in and download another chapter.
To download EBSCO eBooks for offline reading, you will need to set up an account in MyEBSCOhost and download Adobe Digital Editions. Click on this link above to view a short tutorial or a PPT for detailed instructions.