1. Arifin Tasrif, 2015, Fossil Energy So Focused, Said Data, seen December 13, 2020, .
2. Arismunandar, Wiranto 1982, Turbine Start Drive, ITB, Bandung.
3. Cubberly W. 1989, Handbook of Tools and Manufacturing Engineers. Society of Manufacturing Engineers.
4. Note on the Influence of Nitrogen Content on the Resistance to Pitting Corrosion of Stainless Steels
5. E. V. Zaretsky, 1988, Selection of rolling-element bearing steels for long-life applications, USA.