Erna, Maria, Elfizar Elfizar, and Citra Ayu Dewi. 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.