Kumoro, A. C., Wardhani, D. H., Retnowati, D. S., Haryani, K., Yustika, S., & Fajar, T. A. (2021). Extraction of Essential Oil from Ultrasound Pre-treated Citronella Grass (cymbopogon Nardus) Leaves by Hydro-distillation Method. Chemical Engineering Transactions, 87, 643-648. https://doi.org/10.3303/CET2187108