1. International Civil Aviation Organization NTWG (2015) Machine readable travel documents – part 4 – specifications for machine readable passports (MRPs) and other TD3 size MRTDs. http://www.icao.int/publications/Documents/9303_p4_cons_en.pdf
2. ISO/IEC JTC1 SC37 Biometrics (2011) ISO/IEC 19794-1:2011 information technology - biometric data interchange formats - part 1: framework. International Organization for Standardization
3. ISO/IEC JTC1 SC37 Biometrics (2011) ISO/IEC 19794-4:2011 information technology – biometric data interchange formats – part 4: finger image data. International Organization for Standardization
4. ISO/IEC JTC1 SC37 Biometrics (2011) ISO/IEC 19794-5:2011. Information technology - biometric data interchange formats - part 5: face image data. International Organization for Standardization
5. ISO/IEC JTC1 SC37 Biometrics (2019) ISO/IEC 39794-1:2019 information technology - extensible biometric data interchange formats - part 1: framework. International Organization for Standardization