Sudiwijaya, Erwan, and Budi Dwi Arifianto. “Building Differentiation of Piyungan Muhammadiyah High School through Radio Extracurricular School”. Kontribusia : Research Dissemination for Community Development 6, no. 1 (January 2, 2023): 158–161. Accessed July 12, 2025. https://journal.umg.ac.id/index.php/kontribusia/article/view/4823.