Ansyach, A.R.S. and Suyono, S. 2023. Validity of Structured Assignment Sheet to Train Argumentation Skills on Buffer Solution. Hydrogen: Jurnal Kependidikan Kimia. 11, 4 (Aug. 2023), 523–534. DOI:https://doi.org/10.33394/hjkk.v11i4.8610.