Hadzley, A., W. Azahar, A. Anis, R. Izamshah, M. Amran, S. Kasim, and S. Noorazizi. “Development of Surface Roughness Prediction Model Using Response Surface Methodology for End Milling of HTCS-150”. Journal of Advanced Manufacturing Technology (JAMT), vol. 12, no. 1(1), May 2018, pp. 467-76, https://ojsdemo.utem.edu.my/jamt/article/view/4014.