Saleh, Hairus, Nurdyansyah Nurdyansyah, Fitria Nur Hasanah, Hendra Erik Rudyanto, and Mu’alimin Mu’alimin. 2019. “Application of Classroom Response Systems (CRS): Study to Measure Student Learning Outcome”. International Journal of Emerging Technologies in Learning (iJET) 14 (14):pp. 132-142. https://doi.org/10.3991/ijet.v14i14.10506.