Lect. Nada Hashem Abdullah Salman Al-Rikabi and Lect. Alaa Ibrahim Sarhan Al-Khuzai 2020. The Effectiveness of Teaching in the Gibbs Model in Synthesis Thinking Among Second Graders Is Average in History. Journal of Arts, Literature, Humanities and Social Sciences. 56 (Aug. 2020), 296-309. DOI:https://doi.org/10.33193/JALHSS.56.2020.177.