Từ khóa: E-book
Sách điện tử – E-book
- Ebookbrowse http://ebookbrowse.com/
- Findebookee http://findebookee.com/
- 2dix.com http://www.2dix.com/
- The Online Books Page http://onlinebooks.library.upenn.edu/webbin/book/browse?type=subject&c=c&key=aquaculture
- Questia http://www.questia.com/publicdomainindex