<http://schema.org/thumbnailURL>
"http://d28hgpri8am2if.cloudfront.net/book_images/cvr9781451655339_9781451655339_th.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://books.simonandschuster.com/Civilization-and-Its-Enemies/Lee-Harris/9781451655339>