C. Lampe, N. Ellison, и C. Steinfield. CSCW '06: Proceedings of the 2006 20th anniversary conference on Computer supported cooperative work, стр. 167--170. New York, NY, USA, ACM Press, (2006)
F. Benevenuto, T. Rodrigues, M. Cha, и V. Almeida. Proceedings of the 9th ACM SIGCOMM Conference on Internet Measurement, стр. 49--62. New York, NY, USA, ACM, (2009)