Siagian, P. 2019. Improvement High Order Think Skill with Think Pair and Share Learning in Social Arithmetic of the Sekolah Menengah Pertama (SMP) School of Medan. Advances in Social Sciences Research Journal. 6, 6 (Jul. 2019), 68–80. DOI:https://doi.org/10.14738/assrj.66.5821.