1. United Nations General Assembly, Report of the Panel of Governmental Experts on Small Arms, 1997.
2. United Nations Office on Drugs and Crime, Technical Guide to the Implementation of the Protocol against the Illicit Manufacturing of and Trafficking in Firearms, their parts and components and ammunition, supplementing the United Nations Convention against Transnational Organized Crime, 2011.
3. United Nations Office on Drugs and Crime. International Tracing Instrument to Enable States to Identify and Trace, in a Timely and Reliable Manner, Illicit Small Arms and Light Weapons. United Nations Office on Drugs and Crime, 2005.
4. South Eastern and Eastern Europe Clearinghouse for the Control of Small Arms and Light Weapons, Marking of Imported Firearms Under the UN Firearms Protocol, 2010.
5. Small Arms Survey, The Method behind the Mark, 2010.