http://www.ingramspark.com/plan-your-book/print/trim-sizes

Children’s book authors who have been frustrated at the lack of ability to publish a book that is wider than it is tall can now choose the 11 X 8.5 trim size available at IngramSpark. Premium color and paper combined with the landscape size now allows children’s book authors and publishers to publish POD in a manner that competes more effectively with offset printing.

Links of Interest

Trim Size Options