1. Anderson, J., & Gray, C. (2006). Anticorruption in transition 3: who is succeeding…and why? Washington, DC: World Bank.
2. BBC. (2008, July 23). EU suspends funding for Bulgaria. BBC News. http://news.bbc.co.uk/2/hi/europe/7520736.stm . Retrieved 28 November 2015.
3. Cheresheva, M. (2016, January 27). EU seeks results from Bulgaria on corruption. Balkan insight. http://www.balkaninsight.com/en/article/european-commission-urges-bulgaria-to-speed-up-the-fight-against-corruption-01-27-2016 . Retrieved 25 March 2016.
4. Chiriac, M. (2015, October 7). Romania withdraws bid to join Schengen area. Balkan insight. http://www.balkaninsight.com/en/article/romania-bulgaria-face-new-delay-on-joining-schengen-space-10-06-2015 . Retrieved 30 November 2015.
5. Deutsche Welle (2008, July 18). Scathing EU report exposes Bulgaria’s high-level corruption. Deutsche Welle. http://www.dw.com/en/scathing-eu-report-exposes-bulgarias-high-level-corruption/a-3493169 . Retrieved 27 November 2015.