1. Abu-Doleh, J., Weir, D.: Dimensions of performance appraisal systems in jordanian private and public organizations. Int. J. Hum. Res. Manag. (2007)
2. Ahmad, R.: Employees Appraisal: Everything You Have Always Wanted to Know. Lee Ming Press, Kuching (2007)
3. DelPo, A.: The Performance Appraisal Handbook, Legal and Practical Rules For Managers, 2nd (edn.). Consolidated Printers, Inc. USA (2013)
4. Armstrong, M.: Human Resource Management Practice, 8th edn. Kogan Page Publishers, London (2001)
5. Armstrong, M., Baron, A.: Managing Performance: Performance Management in Action. CIPD, London (2005)