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Various sources (nikolanews.com). (February 17, 2021). Most important characteristics to be improved for effective e-mail optimization according to marketers worldwide as of December 2019 [Graph]. In Statista. Retrieved April 13, 2021, from https://www.statista.com/statistics/1040108/characteristics-for-effective-e-mail-marketing-optimization/
Various sources (nikolanews.com). "Most important characteristics to be improved for effective e-mail optimization according to marketers worldwide as of December 2019." Chart. February 17, 2021. Statista. Accessed April 13, 2021. https://www.statista.com/statistics/1040108/characteristics-for-effective-e-mail-marketing-optimization/
Various sources (nikolanews.com). (2021). Most important characteristics to be improved for effective e-mail optimization according to marketers worldwide as of December 2019. Statista. Statista Inc.. Accessed: April 13, 2021. https://www.statista.com/statistics/1040108/characteristics-for-effective-e-mail-marketing-optimization/
Various sources (nikolanews.com). "Most Important Characteristics to Be Improved for Effective E-mail Optimization According to Marketers Worldwide as of December 2019." Statista, Statista Inc., 17 Feb 2021, https://www.statista.com/statistics/1040108/characteristics-for-effective-e-mail-marketing-optimization/
Various sources (nikolanews.com), Most important characteristics to be improved for effective e-mail optimization according to marketers worldwide as of December 2019 Statista, https://www.statista.com/statistics/1040108/characteristics-for-effective-e-mail-marketing-optimization/ (last visited April 13, 2021)
