Lubis, S. P. A. and Kamtini (2023) “The Effect of the Educational Game ‘Edu-Games Bobby Bola’ on Cognitive Ability (Using Number Symbols to Count) Children Aged 5-6 Years at Pembina Tanjung Morawa State Kindergarten 2022/2023 Academic Year”, Indonesian Journal of Advanced Research, 2(8), pp. 1085–1096. doi: 10.55927/ijar.v2i8.5362.