E. Simamora, R., Sidabutar, D. R. and Surya, E. (2017) “Improving Learning Activity and Students”, International Journal of Sciences: Basic and Applied Research (IJSBAR), 33(2), pp. 321–331. Available at: https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/7368 (Accessed: 19 May 2024).