1. ACA (Arms Control Association). (2018). The presidential nuclear initiatives (PNIs) on tactical nuclear weapons at a glance.
https://www.armscontrol.org/factsheets/pniglance
. Accessed 20 May 2018.
2. Auswärtiges Amt. (2014). Jahresabrüstungsbericht.
https://www.auswaertiges-amt.de/blob/216958/3bac6f9ed6aafe972bc54da19dec7d17/abrbericht2014-data.pdf
. Accessed 20 May 2018.
3. Baker, P. (2010, November 16). G.O.P. opposition dims hope for arms treaty with Russia. The New York Times.
https://www.nytimes.com/2010/11/17/world/europe/17start.html
. Accessed 25 February 2019.
4. Brookings Institution. (2019, January 7). Nuclear security and arms control policy.
https://www.c-span.org/video/?456690-1/brookings-forum-examines-nuclear-security-arms-control-policy
. Accessed 29 January 2019.
5. Bustillo, M. (1992). Linkages between vertical and horizontal non-proliferation. In P. Leventhal & S. Tanzer (Eds.), Averting a Latin American nuclear arms race (pp. 171–196). Washington: Macmillan Academic and Professional Ltd.