ISBN direct link
From RCampus Wiki
To include a direct link to a book on any website, add http://www.tbxn.com/isbn/nnn and replace nnn with ISBN of the book you want to link.
[+] Example
To make a direct link to an ISBN number such as 0205337406, make the link look like this:
http://www.tbxn.com/isbn/0205337406
