1.      Google Books

https://books.google.com/

2.      Cộng đồng sách điện tử

http://www.ebook.edu.vn/

3.      The Online Books

http://onlinebooks.library.upenn.edu/webbin/book/browse?type=subject&  

4.      Internet Archive

http://archive.org/browse.php?mediatype=texts   

5.      E-Book Directory

http://www.e-booksdirectory.com/

6.      Directory of Open Access Books

http://www.doabooks.org/doab