Farooq, Umer, Kannampallil, Thomas G., Song, Yang, Ganoe, Craig H., Carroll, John M. and Giles, Lee. "Evaluating tagging behavior in social bookmarking systems: metrics and design heuristics." Paper presented at the meeting of the GROUP '07: Proceedings of the 2007 international ACM conference on Conference on supporting group work, New York, NY, USA, 2007.

Farooq, Umer, Song, Yang, Carroll, John M. and Giles, C. Lee. "Social Bookmarking for Scholarly Digital Libraries." IEEE Internet Computing 11 , no. 6 (2007): 29--35.