<http://schema.org/thumbnailUrl>
<http://www.imore.com/sites/imore.com/files/styles/thumbnail/public/field/image/2013/05/itunes_u_delete_hero.jpg?itok=lXAWmoD0>
<http://www.imore.com/how-delete-courses-within-itunes-u-iphone-and-ipad>