Riasman, Ester Julinda Simarmata, and Rosdiana Samosir. “Cultivating Foundations: A Research-Driven Community Service for Enhancing Early-Grade Education at SD Negeri OKAS”. Jurnal Pengabdian Masyarakat Dan Riset Pendidikan, vol. 2, no. 3, Feb. 2024, pp. 211-6, doi:10.31004/jerkin.v2i3.253.