Damanik, Sarintan Efratani, and Agus Purwoko. “Planning Counseling Methods in Supporting Sustainable Forestry Development in Simalungun Regency”. Jurnal Penelitian Pendidikan IPA 9, no. 4 (April 30, 2023): 2164–2172. Accessed November 22, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/3145.