Marbun, S.D. et al. 2025. Effect of Hot Water Extraction on Contact Angle of Octomeles sumatrana and Duabanga moluccana Woods and Its Correlation to the Extractive Content and Anatomical Structure: Pengaruh Hot Water Extraction terhadap Sudut Kontak Octomeles sumatrana dan Duabanga moluccana dan Kaitannya terhadap Zat Ekstraktif dan Struktur Anatomi Kayu. PERENNIAL. 21, 2 (Oct. 2025), 61–70. DOI:https://doi.org/10.24259/perennial.v21i2.44044.