Kostadinova, I. (1997) Орнитологично Важни МеÑта в Ð’ÑŠÐ»Ð³Ð°Ñ€Ð¸Ñ [Important Bird Areas in Bulgaria]. BSPB Conservation Series, Book 1. Sofia: Bulgarian Society for the Protection of Birds. [In Bulgarian]
Kostadinova, I. and Gramatikov, M. (eds) (2007) Орнитологично Важни МеÑта в Ð’ÑŠÐ»Ð³Ð°Ñ€Ð¸Ñ Ð¸ Ðатура 2000 [Important Bird Areas in Bulgaria and Natura 2000]. BSPB Conservation Series 11. Sofia: Bulgarian Society for the Protection of Birds. [In Bulgarian and English]
European Commission (2014) National Summary for Article 12 2008-2012 Bulgaria
Recommended Citation BirdLife International (2021) Country profile: Bulgaria. Available from http://www.birdlife.org/datazone/country/bulgaria. Checked: 2021-01-26