Guven, B. And Okumus, S. 2011. 8TH GRADE TURKISH STUDENTS' VAN HIELE LEVELS AND CLASSIFICATION OF QUADRILATERALS. 35th Annual Conference of the International-Group-for-the-Psychology-of-Mathematics-Education (PME) , (Ankara, Turkey), 473-480.

Guven, B., & Okumus, S., (2011). 8TH GRADE TURKISH STUDENTS' VAN HIELE LEVELS AND CLASSIFICATION OF QUADRILATERALS . 35th Annual Conference of the International-Group-for-the-Psychology-of-Mathematics-Education (PME) (pp.473-480). Ankara, Turkey

Guven, Bulent, And Samet Okumus. "8TH GRADE TURKISH STUDENTS' VAN HIELE LEVELS AND CLASSIFICATION OF QUADRILATERALS," 35th Annual Conference of the International-Group-for-the-Psychology-of-Mathematics-Education (PME), Ankara, Turkey, 2011

Guven, Bulent And Okumus, Samet. "8TH GRADE TURKISH STUDENTS' VAN HIELE LEVELS AND CLASSIFICATION OF QUADRILATERALS." 35th Annual Conference of the International-Group-for-the-Psychology-of-Mathematics-Education (PME) , Ankara, Turkey, pp.473-480, 2011

Guven, B. And Okumus, S. (2011) . "8TH GRADE TURKISH STUDENTS' VAN HIELE LEVELS AND CLASSIFICATION OF QUADRILATERALS." 35th Annual Conference of the International-Group-for-the-Psychology-of-Mathematics-Education (PME) , Ankara, Turkey, pp.473-480.

@conferencepaper{conferencepaper, author={Bulent Guven And author={Samet Okumus}, title={8TH GRADE TURKISH STUDENTS' VAN HIELE LEVELS AND CLASSIFICATION OF QUADRILATERALS}, congress name={35th Annual Conference of the International-Group-for-the-Psychology-of-Mathematics-Education (PME)}, city={Ankara}, country={Turkey}, year={2011}, pages={473-480} }