bibkat
IBTC GbR
Libby由OverDrive赛阅提供
OverDrive, Inc.
Audible – 亚马逊有声读物
Audible, Inc.
Biblioteket
Redia A/S
Google Play 图书
Google LLC
ReadEra – pdf, epub 电子书阅读器
READERA LLC
Everand: Ebooks and audiobooks
Scribd, Inc.
Wikipedia
Wikimedia Foundation
GALATEA: Novels & Audiobooks
Inkitt Inc
Kobo Books - eBooks Audiobooks
Kobo Books