@article{ŞİMŞEK2019_400203,
author={Zülfiye ZEYBEK ŞİMŞEK and Aslıhan ÜSTÜN},
title={Investigating 7th Grade Students’ Proof Levels About Quadrilaterals},
year={2019},
journal={Necatibey Eğitim Fakültesi Elektronik Fen ve Matematik Eğitimi Dergisi},
issn={1307-6086},
volume={13},
number={1},
url={http://search/yayin/detay/400203}
}