Tampubolon, H. ., Farihah, F., Hanim, H. . and Bahri, H. . (2022) “Development of Interactive E-Books for Production Unit Courses by Implementing a Hybrid Learning System ”, International Journal of Educational Research & Social Sciences , 3(6), pp. 2433–2440. doi: 10.51601/ijersc.v3i6.527.