Wirawijaya, Indra. “Teori Barang Publik Yang Sulit Diimplementasikan”. Jurnal Al Mujaddid Humaniora 7, no. 2 (June 1, 2022): 106-110. Accessed January 26, 2026. https://www.e-jurnal.iims.ac.id/index.php/JALHu/article/view/109.