Pramono, M.T., Gatot Eka, et al. “Retrofit Motor Stepper Mesin CNC 3 Axis UIKA Prototype 3”. AME (Aplikasi Mekanika Dan Energi): Jurnal Ilmiah Teknik Mesin, vol. 3, no. 2, July 2017, p. 60, doi:10.32832/ame.v3i2.770.