E-BOOK
1. Google Books
2. Cộng đồng sách điện tử
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