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Zellner, A. (2015). 21st Century Rewards: A Case Study of Khan Academy and Digital Badges from an Educational Psychology Perspective. In D. Rutledge & D. Slykhuis (Eds.), Proceedings of SITE 2015--Society for Information Technology & Teacher Education International Conference (pp. 1899-1906). Las Vegas, NV, United States: Association for the Advancement of Computing in Education (AACE).