Kusnadi, et al. “Estimation Model of Site Quality of Teak (Tectona Grandis) Using Very High-Resolution Imagery from Unmanned Aerial Vehicle in KPH Nganjuk”. Jurnal Penelitian Kehutanan Wallacea, vol. 5, no. 2, Aug. 2016, pp. 185-94, doi:10.18330/jwallacea.2016.vol5iss2pp185-194.