World Bank, International Telecommunication Union, World Telecommunication/ICT Development Report. “Mobile Cellular subscriptions”. 《World Bank Open Data》. World Bank. 2020년 5월 5일에 확인함.
World Bank, International Telecommunication Union, World Telecommunication/ICT Development Report. “Fixed Broadband Subscriptions”. 《World Bank Open Data》. World Bank. 2020년 5월 5일에 확인함.