1. Lau Hut Yee (2005), Total Revision Science, Malaysia, Sasbadi Shd
Bhd.
2. http://www.proprofs.com/quiz-school/story.php?title=quiz-1_284
3. http://www.proprofs.com/quiz-school/story.php?title=quiz-2_150
4. http://www.multigames.com/game
5. http://www.proprofs.com/games/eyesight-challenge/
6. http://www.proprofs.com/games/word-search/word-search-174/
7. http:// www.youtube.com
8. http://www.scribd.com
