You can also login to your KDP dashboard and click "Bookshelf", then find your book in the list.
Once you have found it, put your mouse over "View on Amazon" this brings up your link from various countries.
From there you can pick what country you want to view, click US for example.
A new tab opens with your book. Then copy and paste that link and give it to a friend or post on Social Media or your website. It is fairly short.