EN 14508 [documento electrónico] : postal services: quality of service: measurement of the transit time of end-to-end services for single piece non-priority mail and second class mail / European Committee for Standardization
CEN/TR 14709 [documento electrónico] : postal services: quality of service: guide for the implementation of EN 13850 / European Committee for Standardization
EN 14012 : postal services: quality of service: measurement of complaints and redress procedures / European Committee for Standardization