(2018). World Telecommunication/ICT Indicators Database: Chronological Time Series 1960-2017 (22nd Edition.). International Telecommunication Union.
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Citação norma Chicago
World Telecommunication/ICT Indicators Database: Chronological Time Series 1960-2017. 22nd Edition. Geneva: International Telecommunication Union, 2018.
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Citação norma MLA
World Telecommunication/ICT Indicators Database: Chronological Time Series 1960-2017. 22nd Edition. International Telecommunication Union, 2018.
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