Chen, Z. ., Chudzicki, C. ., Palumbo, D. ., Alexandron, G. ., Choi, Y.-J. ., Zhou, Q. ., & Pritchard, D. E. (2016). Researching for better instructional methods using AB experiments in MOOCs: results and challenges. Research and Practice in Technology Enhanced Learning, 11. Retrieved from https://rptel.apsce.net/index.php/RPTEL/article/view/2016-11009