Google Play Books & Audiobooks
Google LLC
Box
Amazon Kindle
Amazon Mobile LLC
Epic: Kids' Books & Reading
Epic! Creations Inc
Audible: audiobooks & podcasts
Audible, Inc
Book Box
Aon Mao
ThriftBooks: New & Used Books
Thrift Books Global, LLC.
Bookshelf
Vital Source Technologies
Goodreads
Barnes & Noble NOOK
Barnes & Noble
