Erna, M., Elfizar, E., & Dewi, C. A. (2021). The Development of E-Worksheet Using Kvisoft Flipbook Maker Software Based on Lesson Study to Improve Teacher’s Critical Thinking Ability. International Journal of Interactive Mobile Technologies (iJIM), 15(01), pp. 39–55. https://doi.org/10.3991/ijim.v15i01.15679