1. Abu Bakar Nordin. (2013). Kurikulum ke arah penghasilan kemahiran berfikir kritis, kratif dan inovatif. Jurnal Kurikulum dan Pengajaran Asia Pasifik, 1(1), 10-18
2. Agus Suharto. (2012). Memahami teori psikologi kognitife Piaget: Hubungannya dengan perkembangan anak dalam belajar. Jurnal Edukasi, 7(1), 19-38
3. Arikan, E.E. (2016). Prospective teachers’ belief about problem solvinf in multiple ways. Universal Journal of Educational Research, 4(7), 1727-1733
4. Arslan, C. & Altun, M. (2007). Learning to solve non-routine mathematical problems. Elementary Education Online. 6(1), 50-61.
5. Bal, A. P. (2014). The Examination of Representations Used by Classroom Teacher Candidates in Solving Mathematical Problems. Educational Sciences: Theory and Practice, 14(6), 2349-2365.