Postal development report 2022 [documento eletrónico] : postal journey towards a sustainable future / Universal Postal Union
Statistique des services postaux 2020 / Union Postale Universelle
Postal development report 2021 [documento eletrónico] : taking stock of a new reality / Mauro Boffa, Fernão De Borba and Lukasz Piotrowski
Postal development report 2020 [documento eletrónico] : achieving higher performance amid a major crisis / Mauro Boffa, Fernão De Borba and Lukasz Piotrowski
Statistique des services postaux 2016 / Union Postale Universelle
Statistique des services postaux 2015 / Union Postale Universelle