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Gates Foundation. (December 5, 2014). Distribution of usage of professional development providers for K-12 teachers in the U.S. in 2014, by type of professional development service* [Graph]. In Statista. Retrieved January 24, 2021, from https://www.statista.com/statistics/741569/professional-development-for-teachers-provider-usage-us/
Gates Foundation. "Distribution of usage of professional development providers for K-12 teachers in the U.S. in 2014, by type of professional development service*." Chart. December 5, 2014. Statista. Accessed January 24, 2021. https://www.statista.com/statistics/741569/professional-development-for-teachers-provider-usage-us/
Gates Foundation. (2014). Distribution of usage of professional development providers for K-12 teachers in the U.S. in 2014, by type of professional development service*. Statista. Statista Inc.. Accessed: January 24, 2021. https://www.statista.com/statistics/741569/professional-development-for-teachers-provider-usage-us/
Gates Foundation. "Distribution of Usage of Professional Development Providers for K-12 Teachers in The U.S. in 2014, by Type of Professional Development Service*." Statista, Statista Inc., 5 Dec 2014, https://www.statista.com/statistics/741569/professional-development-for-teachers-provider-usage-us/
Gates Foundation, Distribution of usage of professional development providers for K-12 teachers in the U.S. in 2014, by type of professional development service* Statista, https://www.statista.com/statistics/741569/professional-development-for-teachers-provider-usage-us/ (last visited January 24, 2021)
