1. Acar, O. & Patton, B. R. (2012). Argumentation and formal reasoning skills in an argumentation-based guided inquiry course. Procedia-Social and Behavioral Sciences 46(2012), 4756 – 4760. https://doi.org/10.1016/J.SBSPRO.2012.06.331
2. Akarsu, B., Bayram, K. Slisko, J. & Cruz, A. C. (2013). Understanding elementary students’ argumentation skills through discrepant event marbles in the Jar. International Journal of Scientific Research in Education, 6(3), 221-232.
3. Arifin, Z. (2015). Metodologi penelitian pendidikan, filosofi, teori, & aplikasinya. Surabaya: Lentera Cendekia.
4. Bilgin, I. (2015). The effect of different problem-solving strategies on university students’ problem-solving achievements of quantitative problems in chemistry. Turkey: Faculty of Education, Department of Elementary Education Gölköy-Bolu.
5. Dahar, R. W. (2016). Teori-Teori belajar dan pembelajaran. Jakarta: Erlangga.