If your book is written through Amazon, you could write a hub about it and link to the book on Amazon, or you could even link straight to your site.
-You can also 'Pin' it from your site to Pinterest.
-Create a page for your book on Facebook and promote to friends, who will likely share with their friends.
-In a leap of faith, you can write to Oprah Winfrey and see if she'll help you promote your book. Seriously!