Pratama, R., W. Wartono, and S. 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, vol. 3, no. 1, June 2019, pp. 1-12, doi:10.21067/mpej.v3i1.3142.