Postal development report 2020 [documento eletrónico] : achieving higher performance amid a major crisis / Mauro Boffa, Fernão De Borba and Lukasz Piotrowski
Principles of EU postal regulation and implications for the future [documento eletrónico] / Anna Möller Boivie...[et al.]
Statistique des services postaux 2019 / Union Postale Universelle