Bulgarian. Report on the Current Status of United Nations Romanization Systems for Geographical Names. Compiled by the UNGEGN Working Group on Romanization Systems. Version 4.0, February 2013.
Ainsi, après la démission de la Commission Santer en 1999 : (en) « NATO'S GLOBAL MISSION IN THE TWENTY-FIRST CENTURY », in : Perceptions, Journal of European Affairs, Center for Strategic Research, Ankara, June-August 1999, Volume IV, Number 2, p. 2 (« the EU's predictable harakiri », site internet consulté le 28 juin 2010).
(en) Bulgaria in NATO: Balkan Security and Black Sea Challenges, 2 décembre 2003 : « This is carried out by maintaining the capability and political will to project hard force when necessary against militant, non-democratic regimes, which is justified by their being a threat to regional security, as in Yugoslavia, Afghanistan, and Iraq [...] » (Site du Woodrow Wilson International Center for Scholars, consulté le 15 juin 2010).