II, Harianto. “Increasing Rice Harvest Yields in the Karang Rejo Village Community in Simalungun Regency”. International Journal of Educational Research Excellence (IJERE) 2, no. 2 (December 31, 2023): 674–687. Accessed December 7, 2025. https://ejournal.ipinternasional.com/index.php/ijere/article/view/1576.