1. Abdul Halim, A., Nor Hasniza, I., Johari, S., Marlina, A., & Mohd Hilmi, H. (2014, December 8-10). Non-routine mathematical problems among in-service and pre-service mathematics teachers [Paper presentation]. IEEE International Conference on Teaching, Assessment and Learning for Engineering (TALE). Wellington, New Zealand. https://doi.org/10.1109/TALE.2014.7062620
2. Abdul Rasid, J., Martini, M., & Azhar, M. S. (2017). Penggunaan peta pemikiran i-think dalam pemahaman KOMSAS Bahasa Melayu [Use of i-Think Thinking Maps in understanding KOMSAS Bahasa Melayu]. Jurnal Pendidikan Malaysia, 42(1), 43-51. http://journalarticle.ukm.my/11050/
3. Afifah, F., & Nurbarirah, A. (2017). Thinking outside of the box: Determining students’ level of critical thinking skills in teaching and learning. Asian Journal of University Education, 13(2), 51-70. https://tinyurl.com/y577cnra
4. Afifah, I. R. N., & Retnawati, H. (2019). Is it difficult to teach higher order thinking skills? Journal of Physics: Conference Series, 1320, Article 012098. https://doi.org/10.1088/1742-6596/1320/1/012098
5. Afinde, O. (2016). Pengetahuan, kemahiran dan amalan guru membina item kemahiran berfikir aras tinggi (KBAT) dalam instrumen pentaksiran pembelajaran [Knowledge, skills and practices of teachers in constructing higher order thinking skills (HOTS) items for learning assessment instruments] [Master’s Thesis, Universiti Tun Hussein Onn Malaysia]. eprint UTHM. https://tinyurl.com/hfraedc9