<http://schema.org/thumbnailUrl>
<http://www.imore.com/sites/imore.com/files/styles/thumbnail/public/images/stories/2011/08/mathical-vol-1-1.jpg?itok=_wrt6PNe>
<http://www.imore.com/learn-math-mathical-vol-1-iphone-ipad-kids-corner-giveaway>