"DB Cargo Bulgaria EOOD" (in Bulgarian). Търговски регистър и регистър на ЮЛНЦ. МИНИСТЕРСТВО НА ПРАВОСЪДИЕТО. Retrieved 8 January 2020.
bund.de
bag.bund.de
"Jahresbericht 2018"(PDF) (in German). Bundesamt für Güterverkehr (BAG). p. 31. Archived from the original(PDF) on 24 July 2020. Retrieved 8 January 2020.
bundesfinanzministerium.de
"Deutsche Bahn AG" (in German). Bundesministerium der Finanzen (BMF). Retrieved 8 January 2020.
"Jahresbericht 2018"(PDF) (in German). Bundesamt für Güterverkehr (BAG). p. 31. Archived from the original(PDF) on 24 July 2020. Retrieved 8 January 2020.