Riasman, Ester Julinda Simarmata and Rosdiana Samosir 2024. Cultivating Foundations: A Research-Driven Community Service for Enhancing Early-Grade Education at SD Negeri OKAS. Jurnal Pengabdian Masyarakat dan Riset Pendidikan. 2, 3 (Feb. 2024), 211–216. DOI:https://doi.org/10.31004/jerkin.v2i3.253.