Sen, Shilad, Lam, Shyong K., Rashid, Al Mamunur, Cosley, Dan, Frankowski, Dan, Osterhouse, Jeremy, Harper, F. Maxwell, Riedl, John: tagging, communities, vocabulary, evolution. In: CSCW '06: Proceedings of the 2006 20th anniversary conference on Computer supported cooperative work. New York, NY, USA : ACM, 2006. - ISBN 1-59593-249-6, S. 181--190

Sen, Shilad, Lam, Shyong K., Rashid, Al Mamunur, Cosley, Dan, Frankowski, Dan, Osterhouse, Jeremy, Harper, F. Maxwell, Riedl, John: tagging, communities, vocabulary, evolution. In: CSCW '06: Proceedings of the 2006 20th anniversary conference on Computer supported cooperative work. New York, NY, USA : ACM, 2006. - ISBN 1-59593-249-6, S. 181--190