• Duxiu Knowledge Search Database/ 读秀中文学术搜索 
  provides access to more than 3 million Chinese bibliographic entries and 2 million full text scholarly resources in all subjects and formats, such as books, journal articles, conference papers and video clips.
• HathiTrust 
  A partnership of academic & research institutions, offering a collection of millions of titles digitized from libraries around the world. Many of the Chinese titles and articles are covered in this database.
• 好读    
  Free and good quality Chinese e-book website
• 当当网电子书
• 读书吧电子书