Kemalettin DENİZ, and İsmail Yavuz ÖZTÜRK. “TEACHING GRAPHIC SYMBOLS IN PRIMARY AND SECONDARY SCHOOL TEXTBOOKS OF TURKISH LESSON”. International Journal of Eurasia Social Sciences, vol. 6, no. 18, Mar. 2015, pp. 150-71, https://rrpubs.com/index.php/ijoess/article/view/760.