The Contribution of the Community Forest Program to the Income of the Lumban Lansang Forest Farmer Group, Siantar Utara Village, Parmaksian District, Toba Samosir Regency. Petrop [Internet]. 2023 Jan. 26 [cited 2026 Feb. 4];9(3):201-6. Available from: https://idjpcr.usu.ac.id/jpt/article/view/9234