1. Ahmed , C. (1998, November) . PowerPoint versus traditional overheads. Which is more effective for learning? Paper presented at the meeting of the South Dakota Association for Health, Physical Education and Recreation , Sioux Falls , SD .
2. Allen , D. (2001, May 28) . PowerPointed . Retrieved December 24, 2005, from http://www.textism.com/article/214/
3. Aristotle . (1991) . On rhetoric: A theory of civic discourse (G. A. Kennedy, Trans.) . New York : Oxford University Press .