Sercan DEMİRGÜNEŞ. “A RESEARCH OF 5th, 6th, 7th AND 8th-GRADE TURKISH LESSON TEXTBOOKS ON THE BASIS OF VOCABULARY TEACHING AND WORD FREQUENCIES”. International Journal of Eurasia Social Sciences, vol. 8, no. 26, Mar. 2017, pp. 290-02, https://rrpubs.com/index.php/ijoess/article/view/894.