Ahmad, N., Radin Umar, R., Halim, I., Mohamed, M., Jamli, M. R., Baharudin, M. S., & Hamid, M. (2018). Evaluation of Menu Hierarchy Display Types in Self-Checkout System: Effects on Human Performance. Journal of Advanced Manufacturing Technology (JAMT), 12(1(1), 371–382. Retrieved from https://ojsdemo.utem.edu.my/jamt/article/view/4006