Darmadi Erwin Harahap et al. 2026. Patchouli Oil Quality In Various Methods of Drying Plant Materials Nilam (Pogostemon cablin Benth). International Journal of Science and Environment (IJSE). 6, 2 (Jun. 2026), 916–920. DOI:https://doi.org/10.51601/ijse.v6i2.647.