Peechapol, C., Na-Songkhla, J., Sujiva, S., & Luangsodsai, A. (2018). Development of Smartphone Application Based on the Theory of Planned Behaviour to Enhance Self-Efficacy for Online Learning. International Journal of Interactive Mobile Technologies (iJIM), 12(4), pp. 135–151. https://doi.org/10.3991/ijim.v12i4.8715