To limit the results to whole books, select the Publication tab. (see image below)
Click on the eBook title in the search results.
Highlight and copy the DOI in the eBook record (see image below).
Paste this number into the "DOI" box below.
Click "Create Link".
Your complete link will appear in the "Complete Link" box. If you want to test the complete link to make sure it works, click "Test Link", otherwise, copy the link and paste it into your document or webpage.