1. Adaptive and Intelligent Web-based Educational Systems;Brusilovsky P.;International Journal of Artificial Intelligence in Education. 13(2-- 4):159--172.,2003
2. Smart Sparrow http://aelp.smartsparrow.com/ Smart Sparrow http://aelp.smartsparrow.com/
3. ZyBook http://www.zybooks.com/ ZyBook http://www.zybooks.com/
4. Open DSA Project https://opendsa.cs.vt.edu/ODSA/Books/CS 3/html/index.html http://iiscs.wssu.edu/drupal/OpenDSA Open DSA Project https://opendsa.cs.vt.edu/ODSA/Books/CS 3/html/index.html http://iiscs.wssu.edu/drupal/OpenDSA