Swapbook
Bookswap
BooksRun: Sell books for cash
BooksRun
SWAP by Maritz
Maritz
ThriftBooks: New & Used Books
Thrift Books Global, LLC.
Google Play 图书
Google LLC
Audible – 亚马逊有声读物
Audible, Inc.
Everand: Ebooks and audiobooks
Scribd, Inc.
hoopla Digital
Midwest Tape LLC
Libby由OverDrive赛阅提供
OverDrive, Inc.