Suhartana, S., & Yuniawati. (2019). RIL Skidding Techniques to Improve Productivity and Minimize Production Cost and Environmental Damage (A Case Study at PT Inhutani II Malinau). Jurnal Penelitian Kehutanan Wallacea, 8(2), 113-123. https://doi.org/10.18330/jwallacea.2019.vol8iss2pp113-123