Postal aspects of e-commerce [documento eletrónico] / Antonia Niederprüm, Colum Joyce, Sonja Thiele
2023 European e-commerce report [documento eletrónico] / Sara Lone, Jesse Weltevreden, Aishwarya Luharuwala
State of the postal sector 2023 [documento eletrónico] : a hyper-collaborative path to postal development / Universal Postal Union
e-Commerce report 2023 [documento eletrónico] / Correios de Portugal
Statistique des services postaux 2022 [documento eletrónico] / Union Postale Universelle