| 13. | EN 13724 [documento eletrónico] : postal services: apertures of private letter boxes and letter plates: requirements and test methods / EUROPEAN COMMITTEE FOR STANDARDIZATIONData Publicação: 2013 Tema: Normas |  | |
| 14. | EN 14012 [documento eletrónico] : Postal services - quality of service - complaints handling principlesData Publicação: 2019 Tema: Normas | | |
| 15. | EN 13850 [documento eletrónico] : postal services - quality of services - measurement of the transit time of end-to-end services for single piece priority mail and first class mailData Publicação: 2020 Tema: Normas | | |