“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”. 2023. Jurnal Online Pertanian Tropik 9 (3): 201-6. https://doi.org/10.32734/jopt.v9i3.9234.