1. Handbook of Biometrics;Jain,2008
2. ISO/IEC 19795, Information technology – Biometric performance testing and reporting;ISO/IEC JTC1/SC37,2006
3. ISO/IEC 19784–1, Information technology – Biometric application programming interface – Part 1: BioAPI specification;ISO/IEC JTC1/SC37,2005
4. Office of the Privacy Commissioner for Personal Data, Hong-Kong, http://www.pcpd.org.hk/engindex.html.