CEN/TR 14709 [documento electrónico] : postal services: quality of service: guide for the implementation of EN 13850 / European Committee for Standardization
CEN/TR 15472 [documento electrónico] : postal services: measurement of transit times for parcels by the use of a track and trace system / European Committee for Standardization
CEN/TS 15511 [documento electrónico] : postal services: quality of service: information available on postal services / European Committee for Standardization