1. Failures of gears, in Failure Analysis and Prevention, ASM Handbook, vol. 11 (ASM, Metals Park, OH, 2002). ISBN: 0-87170-704-7
2. L.E. Alban, Failures of Gears, Metals Handbook, 9th edn., vol. 11, in Failure Analysis and Prevention (1986), pp. 586–601
3. O. Asi, Fatigue failure of a helical gear in a gearbox. Eng. Fail. Anal. 13, 1116–1125 (2006)
4. S.K. Bhaumik et al., Failure of an intermediate gearbox of a helicopter. Eng. Fail. Anal. 14, 85–100 (2007)
5. Fractography, Metals Handbook, vol. 12 (ASM, Metals Park, OH, 1987). ISBN: 978-0-87170-018-6