1. Dolores Garcia Piera helped us with historical information
2. Octavio Muñoz helped us with technical problems with the web page.
3. "Coalition to reduce nuclear dangers" 01/01/02<http://www.clw.org/archive/coalition/> (23/02/06)
4. "La Segunda Guerra Mundial" <http://es.wikipedia.org/wiki/Segunda_Guerra_Mundial> (21/02/06)
5."La Segunda Guerra Mundial" <http://personal.telefonica.terra.es/web/sori/Historia.htm> (25/02/06)
6. "La segunda Guerra Mundial" <http://www.ajzanier.com.ar/> (25/02/06)
7. Lee Lanning, Michael Inside the Crosshairs: Snipers in Vietnam Ballantine Books, 1998
8. Quincy Wright. A Study of War, 2 vols., Chicago: University of Chicago Press, [1942] rev. ed. 1965.
9. "The World at War, history of WW 1939-1945" <http://www.euronet.nl/users/wilfried/ww2/ww2.htm> (26/02/06)
10. "Technology of war" [Online] <http://science.howstuffworks.com/war-tech.htm> (21/02/06)
11. "The technology of war" <http://fp.miranda.f9.co.uk/ww1/technology.html> (21/02/06)
12."The Second World War Encyclopaedia" <http://www.spartacus.schoolnet.co.uk/2WW.htm> (21/02/06)
13.U.N. <http://www.onu.org/> (25/02/06)
14. U.N. "Peace and security through diarmament" 2003 <http://disarmament.un.org/> (23/02/06)
15. U.N. "Weapons of mass destruction, Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on Their Destruction" 2002 <http://disarmament.un.org/wmd/cwc/index.html> (23/02/06)
16.U.N. "Weapons of mass destruction, Convention on the Prohibition of the Development, Production and Stockpiling of Bacteriological (Biological) and Toxin Weapons and on their Destruction" 2002 <http://disarmament.un.org/wmd/bwc/index.html> (23/02/06)
17.U.N. "Weapons of mass destruction, Missiles" 2002 <http://disarmament.un.org/wmd/missiles.htm> (23/02/06)
18. U.N. "Weapons of mass destruction, Comprehensive Nuclear-Test-Ban Treaty" 2002 <http://disarmament.un.org/wmd/ctbt/index.html> (23/02/06)
19. U.N. "Weapons of mass destruction, Treaty on the Non-Proliferation of Nuclear Weapons (NPT)" 2002 <http://disarmament.un.org/wmd/npt/index.html> (23/02/06)
20. U.N. "Terrorism and Disarmament. The role of the Department for Disarmament Affairs" 2002 <http://disarmament.un.org/terrorism.htm> (23/02/06)
21. Velez, Alberto "La Primera Guerra Mundial, causas y consecuencias de la Primera Guerra Mundial" <http://www.portalplanetasedna.com.ar/guerra1.htm> (26/02/06)
22. Wikipedia Encyclopedia "Diplomacia" 28/01/06 <http://es.wikipedia.org/wiki/Diplomacia> (20/02/06)
23. Wikipedia Encyclopedia "Invasión de Iraq de 2003" 03/03/06 <http://es.wikipedia.org/wiki/Invasi%C3%B3n_de_Iraq_de_2003> (28/02/06)
24.Townsend, Tom "Machine gun" <http://www.tomtownsend-toyland.com/toyland/m1917_machine_gun.htm> (26/02/06)