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Publishers Weekly. (April 25, 2018). Unit sales of e-books in the United States in 2016 and 2017 (in millions) [Graph]. In Statista. Retrieved November 25, 2020, from https://www.statista.com/statistics/191992/sales-of-e-books-in-the-us-since-2006/
Publishers Weekly. "Unit sales of e-books in the United States in 2016 and 2017 (in millions)." Chart. April 25, 2018. Statista. Accessed November 25, 2020. https://www.statista.com/statistics/191992/sales-of-e-books-in-the-us-since-2006/
Publishers Weekly. (2018). Unit sales of e-books in the United States in 2016 and 2017 (in millions). Statista. Statista Inc.. Accessed: November 25, 2020. https://www.statista.com/statistics/191992/sales-of-e-books-in-the-us-since-2006/
Publishers Weekly. "Unit Sales of E-books in The United States in 2016 and 2017 (in Millions)." Statista, Statista Inc., 25 Apr 2018, https://www.statista.com/statistics/191992/sales-of-e-books-in-the-us-since-2006/
Publishers Weekly, Unit sales of e-books in the United States in 2016 and 2017 (in millions) Statista, https://www.statista.com/statistics/191992/sales-of-e-books-in-the-us-since-2006/ (last visited November 25, 2020)
