“KUALITAS DAMAR POHON POOTI (Hopea Gregaria) BERDASARKAN UJI VISUAL, BILANGAN ASAM, DAN KADAR ABU: Quality of Pooti Dammar Resin (Hopea Gregaria) Based on Visual Test, Acid Number, and Ash Content”. 2021. PERENNIAL 17 (1): 1-4. https://doi.org/10.24259/perennial.v17i1.12646.