Şahin, Muhittin. “Classroom Response Systems As a Formative Assessment Tool: Investigation into Students’ Perceived Usefulness and Behavioural Intention”. International Journal of Assessment Tools in Education 6, no. 4 (December 19, 2019): 693-705. Accessed February 28, 2020. http://ijate.net/index.php/ijate/article/view/809.