S. Ferebee, and J. Davis. Persuasive '09: Proceedings of the 4th International Conference on Persuasive Technology, page 1--8. New York, NY, USA, ACM, (2009)
C. Marlow, M. Naaman, D. Boyd, and M. Davis. HYPERTEXT '06: Proceedings of the seventeenth conference on Hypertext and hypermedia, page 31--40. New York, NY, USA, ACM, (2006)