1. BAUBÖCK, R. 2018. Democratic Inclusion: A Pluralist Theory of Citizenship. In Democratic inclusion: Rainer Bauböck in dialogue [online]. Manchester University Press, 2018. ISBN 978 1 5261 0525 7. pp. 3-102. Retrieved from: https://doi.org/10.7765/9781526105257.00007
2. Bulgaria amends its citizenship law [online]. 2021. Global Citizenship Observatory. [Accessed on 07.06.2021]. Retrieved from: https://globalcit.eu/bulgaria-amends-its-citizenship-law/
3. Bulgarian Citizenship Act. 1998. Prom. SG No. 136, 18 November 1998, as subsequently amended and supplemented. Retrieved from: https://data.globalcit.eu/NationalDB/docs/Bulgarian%20Citizenship%20Act%20-%20bilingual_4.pdf
4. Bulgaria's golden passports scheme bring little investment [online]. 2020. Euractiv. [Accessed on 10.06.2021]. Retrieved from: https://www.euractiv.com/section/justice-home-affairs/news/bulgarias-golden-passports-scheme-bring-little-investment/
5. BUTTIGIEG, E., DEBONO, D. 2015. Country report on citizenship law: Malta [online]. EUDO Citizenship Observatory. Florence: European University Institute. Retrieved from: https://cadmus.eui.eu/bitstream/handle/1814/34482/EUDO_CIT_2015_05-Malta.pdf?sequence=1&isAllowed=y