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Kartika, Windy, et al. “The Effectiveness of the Four-Step Jigsaw and Jigsaw Learning Model in Improving students’ Argumentation Skills about Salt Hydrolysis Concept”. Jurnal Pendidikan Kimia, vol. 13, no. 3, Dec. 2021, pp. 241-9, doi:10.24114/jpkim.v13i3.29929.