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Nielsen. (September 30, 2011). Smartphone penetration in the United States in 2009 and 2011, by age [Graph]. In Statista. Retrieved January 20, 2021, from https://www.statista.com/statistics/216345/us-smartphone-penetration-since-2009-by-age/
Nielsen. "Smartphone penetration in the United States in 2009 and 2011, by age." Chart. September 30, 2011. Statista. Accessed January 20, 2021. https://www.statista.com/statistics/216345/us-smartphone-penetration-since-2009-by-age/
Nielsen. (2011). Smartphone penetration in the United States in 2009 and 2011, by age. Statista. Statista Inc.. Accessed: January 20, 2021. https://www.statista.com/statistics/216345/us-smartphone-penetration-since-2009-by-age/
Nielsen. "Smartphone Penetration in The United States in 2009 and 2011, by Age." Statista, Statista Inc., 30 Sep 2011, https://www.statista.com/statistics/216345/us-smartphone-penetration-since-2009-by-age/
Nielsen, Smartphone penetration in the United States in 2009 and 2011, by age Statista, https://www.statista.com/statistics/216345/us-smartphone-penetration-since-2009-by-age/ (last visited January 20, 2021)
