Casandra, A.B. et al. 2025. The Effect of Cooperative Learning Model Type Student Team Achievement Divisions (STAD) Assisted by Virtual Media on Students’ Concept Mastery Ability. International Journal of Contextual Science Education. 2, 2 (Jun. 2025), 39–46. DOI:https://doi.org/10.29303/ijcse.v2i2.1010.