E. SIMAMORA, R.; SIDABUTAR, D. R.; SURYA, E. Improving Learning Activity and Students. International Journal of Sciences: Basic and Applied Research (IJSBAR), [S. l.], v. 33, n. 2, p. 321–331, 2017. Disponível em: https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/7368. Acesso em: 19 may. 2024.