معاونت دیپلماسی اقتصادی وزارت امور خارجه جمهوری اسلامی ایران
https://en.wikipedia.org/wiki/List_of_countries_by_road_network_size
https://www.citypopulation.de/en/world/bymap/Roadways.html
https://www.citypopulation.de/en/world/bymap/Railways.html
data.worldbank.org/indicator?tab=all
شاخص Rail lines (total route-km)
https://www.citypopulation.de/en/world/bymap/TelephoneLines.html
speedtest.net
intrnational telecomunication union
https://www.citypopulation.de/en/world/bymap/MobilePhones.html
شاخص Mobile cellular subscriptions
https://en.wikipedia.org/wiki/List_of_countries_by_vehicles_per_capita
national master.com
report ofEIA
wrl
ppibaedb
paec