Rashid AM, Ling K, Tassone RD, Resnick P, Kraut R, Riedl J. Motivating Participation by Displaying the Value of Contribution. In ACM SIGCHI Conference on Human Factors in Computing Systems. Montreal, Quebec, Canada: ACM; 2006. pp. 955-958.
Sen S, Lam SK, Cosley D, Rashid AM, Frankowski D, Harper F, et al.. tagging, community, vocabulary, evolution. In Computer Supported Cooperative Work. Banff, Alberta, Canada: ACM; 2006. pp. 181-190.