D. C. Pandiangan, T. Supriana, and A. Nuryawan, “Analysis of the Contribution of Utilization of Non-Wood Forest Products to the Income (Case Study at Some Village Communities Around the Forest of North Tapanuli Regency, North Sumatra, Indonesia)”, J. Sylva Indonesiana, vol. 6, no. 02, pp. 149-163, Aug. 2023.