Hastono Wijaya, Femiana Gapsari. “The Effect of Cutting Parameter towards Surface Roughness in Conventional Turning”. International Journal of Emerging Trends in Science and Technology, Vol. 4, no. 04, Apr. 2017, pp. 5114-7, http://igmpublication.org/ijetst.in/index.php/ijetst/article/view/1014.