Witri, Esa, Ngatijo Ngatijo, and Muhammad Haris Effendi-Hasibuan. 2020. “Development of Electronic Student Worksheets Based on Toulmin Argumentation Patterns to Improve Argumentation Skills in Basic Acid Materials”. Jurnal Pendidikan Kimia 12 (3):116-23. https://doi.org/10.24114/jpkim.v12i3.21160.