W. Ketter, A. Batchu, G. Berosik, и D. McCreary. ICEC '08: Proceedings of the 10th international conference on Electronic commerce, стр. 1-10. New York, NY, USA, ACM, (2008)
K. Sia, .. J, K. Hino, Y. Chi, S. Zhu, и B. Tseng. , in Proceedings of the International Conference on Weblogs and Social Media (Boulder Colorado, March 2007),, стр. 161-168. (2007)