Öztekin, C. Et Al. 2001. Biology Concepts Perceived as Difficult by Turkish High School Students. Hacettepe Eğitim Dergisi , vol.21 , 145-150.

Öztekin, C., Özkan, Ö., & Sungur, S., (2001). Biology Concepts Perceived as Difficult by Turkish High School Students. Hacettepe Eğitim Dergisi , vol.21, 145-150.

Öztekin, CEREN, Özlem Özkan, And SEMRA SUNGUR. "Biology Concepts Perceived as Difficult by Turkish High School Students," Hacettepe Eğitim Dergisi , vol.21, 145-150, 2001

Öztekin, CEREN Et Al. "Biology Concepts Perceived as Difficult by Turkish High School Students." Hacettepe Eğitim Dergisi , vol.21, pp.145-150, 2001

Öztekin, C. Özkan, Ö. And Sungur, S. (2001) . "Biology Concepts Perceived as Difficult by Turkish High School Students." Hacettepe Eğitim Dergisi , vol.21, pp.145-150.

@article{article, author={CEREN ÖZTEKİN Et Al. }, title={Biology Concepts Perceived as Difficult by Turkish High School Students}, journal={Hacettepe Eğitim Dergisi}, year=2001, pages={145-150} }