1. Atlas Copco Face Drilling Third Edition. Örebro: Atlas copco Rock Drills (AB2004).
2. Introduction to surface hardening of steel ASM handbook;Lampman,1991
3. Surface Hardening of Steels: Understanding the Basics;Davis,2002
4. Handbook of Residual Stress and Deformation of Steel;Totten,2002
5. ASM Handbook: Volume 19, Fatigue and Fracture, Bending Fatigue of Carburized Steels;Lampman,1996