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)
B. Barkstrom, M. Finch, M. Ferebee, and C. Mackey. Proceedings of the Second ACM/IEEE-CS Joint Conference on Digital Libraries, page 242-243. Portland, Oregon, ACM Press, (July 2002)