1. http://apcentral.collegeboard.com 2005. http://apcentral.collegeboard.com 2005.
2. Expanding the pipeline: In a more balanced computer science environment, similarity is the difference and computer science is the winner;Blum Lenore;CRA Newsletter,2005
3. Steve Borgatti. http://www.analytictech.com. Steve Borgatti. http://www.analytictech.com.
4. Kathleen M. Carley. Casos. http://www.casos.cs.cmu.edu. Kathleen M. Carley. Casos. http://www.casos.cs.cmu.edu.