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IDC. (February 24, 2017). Forecast for worldwide wireless voice telecom spending from 2015 to 2020 (in billion U.S. dollars) [Graph]. In Statista. Retrieved June 24, 2021, from https://www.statista.com/statistics/325250/worldwide-wireless-voice-telecom-spending-forecast/
IDC. "Forecast for worldwide wireless voice telecom spending from 2015 to 2020 (in billion U.S. dollars)." Chart. February 24, 2017. Statista. Accessed June 24, 2021. https://www.statista.com/statistics/325250/worldwide-wireless-voice-telecom-spending-forecast/
IDC. (2017). Forecast for worldwide wireless voice telecom spending from 2015 to 2020 (in billion U.S. dollars). Statista. Statista Inc.. Accessed: June 24, 2021. https://www.statista.com/statistics/325250/worldwide-wireless-voice-telecom-spending-forecast/
IDC. "Forecast for Worldwide Wireless Voice Telecom Spending from 2015 to 2020 (in Billion U.S. Dollars)." Statista, Statista Inc., 24 Feb 2017, https://www.statista.com/statistics/325250/worldwide-wireless-voice-telecom-spending-forecast/
IDC, Forecast for worldwide wireless voice telecom spending from 2015 to 2020 (in billion U.S. dollars) Statista, https://www.statista.com/statistics/325250/worldwide-wireless-voice-telecom-spending-forecast/ (last visited June 24, 2021)
