1. Ashlock, R. B. (2006). Error patterns in computation: Using error patterns to improve instruction (9th ed.). Upper Saddle River: Pearson education, Inc.
2. Brown, D. L., & Presmeg, N. C. (1993). Types of imagery used by elementary and secondary school students in mathematical reasoning. In Proceedings of the 17 th Annual Meeting of the International Group for the Psychology of Mathematics Education (Vol. II, pp. 137–144), Tsukuba.
3. Butler, F. M., Miller, S. P., Crehan, K., Babbitt, B., & Pierce, T. (2003). Fraction instruction for students with mathematics disabilities: Comparing two teaching sequences. Learning Disabilities Research and Practice, 18, 99–111.
4. Connolly, A. J. (2007). KeyMath-3 diagnostic assessment. San Antonio: Pearson.
5. Corbin, J., & Strauss, A. (2008). Basics of qualitative research. Thousand Oaks: Sage.