"FP7 Security Research", Community Research and Development Information Service (CORDIS), European Commission, 3a Septembro 2012. Konsultita la 15an Septembro 2013.
Surveillance: Citizens and the State, HL 18-I (report) and HL 18-II (evidence), House of Lords Constitution Committee, 6a Februaro 2009. Konsultita la 8a Februaro 2009.
"Centralised System to Monitor Communicaitons", reago de Shri Gurudas Kamat, Minister of State for Communications and Information Technology in Rajya Sabha, Press Information Bureau, 26a Novembro 2009. Konsultita la 17an Septembro 2013.
Data Priest kaj William M. Arkin (20-a de decembro 2010) Monitoring America. Top Secret America, A Washington Post Investigation. Washington Post. Alirita 27a Januaro 2011 .