Pratama, Rahmadhani, Wartono Wartono, and Sentot Kusairi. “The Effect of Ideal Strategy With Formative Feedback on Conceptual Understanding and Physics Processing Skill of XI Graders Senior High School”. Momentum: Physics Education Journal 3, no. 1 (June 24, 2019): 1-12. Accessed December 8, 2019. http://ejournal.unikama.ac.id/index.php/momentum/article/view/3142.