Ima Puspita Rukmi, Sindy Chintyawati, and Bayu Setiaji. “Facilitating Physics Problem-Solving Skills With Geometry Optics E-Module Flipbook View: A Reliability Test”. Impulse: Journal of Research and Innovation in Physics Education, vol. 2, no. 1, June 2022, pp. 1-15, doi:10.14421/impulse.2022.21.01.