UNE-EN 14508:2016 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 (Endorsed by Asociación Española de Normalización in August of 2018.)
2018UNE-EN 14508:2016 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 (Endorsed by Asociación Española de Normalización in August of 2018.)
2008UNE-EN 14508:2003+A1:2008 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