Ridwan, et al. “Tetraploid Teak Seedling Was More Tolerant to Drought Stress Than Its Diploid Seedling”. Jurnal Penelitian Kehutanan Wallacea, vol. 7, no. 1, Mar. 2018, pp. 1-11, doi:10.18330/jwallacea.2018.vol7iss1pp1-11.