1. Wisnuadi, R.A. and Fahma F, Industrial Engineering Conference (IDEC), 215–223 (2016).
2. Khotimah, C. and Mashuri, M., Jurnal Sains dan Seni ITS 4, No.1, D1–D6 (2015).
3. Juran, Quality Control Handbook Fourth Edition (McGrawoHill, New York, 1998).
4. Lepage, Alain, Hard Machining Course (Grinding Theory) (PT. SKF Indonesia Hand Book, 2001).
5. Lidkoping, Hard Machining & Assembly (SKF College, 1996).