“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), pp. 1–4. doi:10.24259/perennial.v17i1.12646.