1. [1] TEMPO Online. (2018). Resident population (POP105A). Retrieved April 01, 2019, from http://statistici.insse.ro:8077/tempo-online/#/pages/tables/insse-table.
2. [2] UrbanRail.Net > Europe > Romania > BUCHAREST Tram. (2019). Retrieved April 30, 2019, from http://www.urbanrail.net/eu/ro/buc/bucuresti-tram.htm.
3. [3] STB SA | Societatea de Transport Bucuresti STB SA. (2019). Retrieved April 30, 2019, from http://stbsa.ro/statistici.php.
4. [4] Rom Engineering Ltd, AVENSA Consulting SRL (2016). Durable Urban Mobility Plan 2016-230 for the Bucharest-Ilfov Region. Retrieved April 01, 2019, from https://tpbi.ro/files/proiect_pmud.pdf.
5. [5] TPBI. (n.d.). General Informations. Retrieved April 30, 2019, from https://tpbi.ro/constituire