@article{TEKKAYA2005_50465,
author={Ceren TEKKAYA and Semra SUNGUR and Ayşe YANİLMEZ},
title={Investigating Students' Logical Thinking Abilities: The Effects of Gender and Grade Level},
year={2005},
journal={Hacettepe Üniversitesi Eğitim Fakültesi Dergisi},
issn={1300-5340},
volume={2005},
number={28},
url={http://search/yayin/detay/50465}
}