Jasmin, F. et al. 2025. Optimization of Extraction Parameters for Phenolics and Flavonoids from Peony (Paeonia lactiflora) Flowers Using Ultrasound-Assisted Extraction. Hydrogen: Jurnal Kependidikan Kimia. 13, 1 (Feb. 2025), 1–11. DOI:https://doi.org/10.33394/hjkk.v13i1.14346.