1. Elia, I., Özel, S., Gagatsis, A., Panaoura, A., & Yetkiner-Özel, Z. E. (2016). Students’ mathematical work on absolute value: focusing on conceptions, errors and obstacles. ZDM Mathematics Education, 48(6), 895-907. DOI 10.1007/s11858-016-0780-1
2. Özel, S., Yetkiner Özel, Z. E., & Cifuentes, L. D. (2014). Effectiveness of an online manipulative tool and students’ technology acceptances. International Journal of Educational Studies in Mathematics, 1(1), 1-15.
3. Matteson, S. M., Zientek, L. R., & Özel, S. (2013). Identifying what in-service teachers want in professional development experiences. Teacher Education and Practice, 26(3), 569-580.
4. Zientek, L. R., Yetkiner Özel, Z. E., Özel, S., & Allen, J. (2012). Reporting confidence intervals and effect sizes: Collecting the evidence. Career and Technical Education Research, 37(3), 277-295. doi: 10.5328/cter37.3.277
5. *Ölmez, İ. B., & Özel, S. (2012). Mathematics anxiety among sixth and seventh grade Turkish elementary school students. Procedia – Social and Behavioral Sciences, 46, 4933-4937.
6. Özel, S. (2012). Learning rational numbers: An experimental multi-modal representation approach via technology. Mediterranean Journal for Research in Mathematics Education: An International Journal, 11(1-2), 59-79.
7. *Başol, B., Özel, S., & Özel-Yetkiner, Z. E. (2012). The relationship between reading comprehension competence and word problem comprehension among third-grade students. Journal of European Education, 1(1), 1-8.
8. Capraro, R. M., Capraro, M. M., Yetkiner, Z. E., Corlu, M. S., Özel, S., Ye, S., & Kim, H. G. (2011). An international perspective on students’ understanding of the equal sign. Mediterranean Journal for Research in Mathematics Education: An International Journal, 10, 185-211.
9. Özel, S., Yetkiner, Z. E., & Capraro, R. M. (2008). Technology in k-12 mathematics classrooms. School Science and Mathematics, 108, 80-85.
10. Cifuentes, L., & Özel, S. (2006). Resources for attending to the needs of multicultural learners. Knowledge Quest, 35(2), 12-19.