Rafiola, R.H. et al. 2020. The Effect of Learning Motivation, Self-Efficacy, and Blended Learning on Students’ Achievement in The Industrial Revolution 4.0. International Journal of Emerging Technologies in Learning (iJET). 15, 08 (Apr. 2020), pp. 71–82. DOI:https://doi.org/10.3991/ijet.v15i08.12525.