Postal services [documento electrónico] : mail item processing: optical characteristics for processing letters: EN 13619: November 2002 / European Committee for Standardization
Postal services [documento electrónico] : forms: harmonised vocabulary: ENV 13712: April 2000 / European Committee for Standardization
Postal services [documento electrónico] : quality of service: measurement of the transit time of end-to-end services for single piece priority mail and first class mail: EN 13850: Mai 2002 / European Committee for Standardization
EN 14012 : postal services: quality of service: measurement of complaints and redress procedures / European Committee for Standardization