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Ofcom. (January 28, 2021). International calls volume of British Telecommunications (BT) in the United Kingdom (UK) from 2009 to 2020 (in millions of minutes) [Graph]. In Statista. Retrieved May 16, 2021, from https://www.statista.com/statistics/287238/bt-volume-of-international-calls/
Ofcom. "International calls volume of British Telecommunications (BT) in the United Kingdom (UK) from 2009 to 2020 (in millions of minutes)." Chart. January 28, 2021. Statista. Accessed May 16, 2021. https://www.statista.com/statistics/287238/bt-volume-of-international-calls/
Ofcom. (2021). International calls volume of British Telecommunications (BT) in the United Kingdom (UK) from 2009 to 2020 (in millions of minutes). Statista. Statista Inc.. Accessed: May 16, 2021. https://www.statista.com/statistics/287238/bt-volume-of-international-calls/
Ofcom. "International Calls Volume of British Telecommunications (Bt) in The United Kingdom (Uk) from 2009 to 2020 (in Millions of Minutes)." Statista, Statista Inc., 28 Jan 2021, https://www.statista.com/statistics/287238/bt-volume-of-international-calls/
Ofcom, International calls volume of British Telecommunications (BT) in the United Kingdom (UK) from 2009 to 2020 (in millions of minutes) Statista, https://www.statista.com/statistics/287238/bt-volume-of-international-calls/ (last visited May 16, 2021)
