• U.S. Department of Justice. The National Strategy for Child Exploitation Prevention and Interdiction: A Report to Congress, August 2010.
• U.S. Department of Justice. The National Strategy for Child Exploitation Prevention and Interdiction: A Report to Congress, April 2016.
• European Union Agency for Law Enforcement Cooperation. Internet Organised Crime Threat Assessment, Technical Report (10.2813/858843), Europol, 2018.
• Roderic Broadhurst and Matthew Ball, Tor’s underworld, ‘onion services’ and child sex abuse material: Submission to the Australian Parliamentary Joint Committee on Law Enforcement inquiry into ‘Law enforcement capabilities in relation to child exploitation’ (September 21, 2021).
• Brian Levine, Report to Congress: Increasing the Efficacy of Investigations of Online Child Sexual Exploitation, May 2022. On behalf of the National Institute of Justice.
• U.S. Department of Justice. National Strategy for Child Exploitation Prevention and Interdiction, 2023.