ÖZGÜN KOCA, S. A. And KAYHAN ALTAY, M. 2009. An Investigation of Proportional Reasoning Skills of Middle School Students. Investigations in Mathematics Learning , vol.2 , 26-49.

ÖZGÜN KOCA, S. A., & KAYHAN ALTAY, M., (2009). An Investigation of Proportional Reasoning Skills of Middle School Students. Investigations in Mathematics Learning , vol.2, 26-49.

ÖZGÜN KOCA, S, And MESTURE KAYHAN ALTAY. "An Investigation of Proportional Reasoning Skills of Middle School Students," Investigations in Mathematics Learning , vol.2, 26-49, 2009

ÖZGÜN KOCA, S A. And KAYHAN ALTAY, MESTURE K. . "An Investigation of Proportional Reasoning Skills of Middle School Students." Investigations in Mathematics Learning , vol.2, pp.26-49, 2009

ÖZGÜN KOCA, S. A. And KAYHAN ALTAY, M. (2009) . "An Investigation of Proportional Reasoning Skills of Middle School Students." Investigations in Mathematics Learning , vol.2, pp.26-49.

@article{article, author={S ASLI ÖZGÜN KOCA And author={MESTURE KAYHAN ALTAY}, title={An Investigation of Proportional Reasoning Skills of Middle School Students}, journal={Investigations in Mathematics Learning}, year=2009, pages={26-49} }