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Team Bookis
Google Play 图书
Google LLC
Bookly: Book & Reading Tracker
SC TWODOOR GAMES SRL
Book of the Month
BookBeat Ljudböcker & E-böcker
BookBeat
Amazon Kindle
Amazon Mobile LLC
Libby由OverDrive赛阅提供
OverDrive, Inc.
Audible – 亚马逊有声读物
Audible, Inc.
hoopla Digital
Midwest Tape LLC
Bookshelf
Vital Source Technologies