Pinondang Nainggolan. “KEBIJAKAN INVESTASI DI KABUPATEN BATUBARA”. J-ABDI: Jurnal Pengabdian kepada Masyarakat 1, no. 1 (August 3, 2021): 53–68. Accessed October 30, 2025. https://bajangjournal.com/index.php/J-ABDI/article/view/146.