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App Annie. (June 27, 2017). Gross expenditure on in-app advertising and mobile app stores worldwide in 2016, 2017 and 2021 (in billion U.S. dollars) [Graph]. In Statista. Retrieved January 17, 2021, from https://www.statista.com/statistics/241245/gross-app-spending/
App Annie. "Gross expenditure on in-app advertising and mobile app stores worldwide in 2016, 2017 and 2021 (in billion U.S. dollars)." Chart. June 27, 2017. Statista. Accessed January 17, 2021. https://www.statista.com/statistics/241245/gross-app-spending/
App Annie. (2017). Gross expenditure on in-app advertising and mobile app stores worldwide in 2016, 2017 and 2021 (in billion U.S. dollars). Statista. Statista Inc.. Accessed: January 17, 2021. https://www.statista.com/statistics/241245/gross-app-spending/
App Annie. "Gross Expenditure on In-app Advertising and Mobile App Stores Worldwide in 2016, 2017 and 2021 (in Billion U.S. Dollars)." Statista, Statista Inc., 27 Jun 2017, https://www.statista.com/statistics/241245/gross-app-spending/
App Annie, Gross expenditure on in-app advertising and mobile app stores worldwide in 2016, 2017 and 2021 (in billion U.S. dollars) Statista, https://www.statista.com/statistics/241245/gross-app-spending/ (last visited January 17, 2021)