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- „Zhelezopaten Transport” (Railway Transport) magazine, issue 10/2007; See document
- „Zheleznichar” newspaper, issue 16/2007; See document
- „Bulgarski transporten vestnik” newspaper, issue 14/2007; See document
- Excerpt from the website of the Ministry of transport and communication of the Republic of Bulgaria – 2002; See document (PDF)
- ”Fakt” newspaper, issue 62/2000; See document
- National Railway Infrastructure Company – Central Administration; See document
- BDZ General administration, “Railway infrastructure” section; See document
- ZhS Barno, Czech Republic; See document
- National Railway Infrastructure Company – Railway Intrastructure Operation and Maintenance Subdivision Russe; See document
- National Railway Infrastructure Company – Railway Intrastructure Operation and Maintenance Subdivision Stara Zagora; See document
- BTC EAD, National administration „Radio and television stations”; See document
- Cadastre Agency, Bureau for cadastre - Smolyan; See document
- Ministry of Agriculture and Foods, Land commission „Vrabnitsa”, Sofia; See document
- Straldzha municipality, Yambol region; See document
- Ministry of labour and social policy, Project “Beautiful Bulgaria”. See document
