Commentarios ao regulamento dos correios do Brasil / Francisco José de Almeida Brant; pref. Faria Rocha
Dokumentation über das post- und fernmeldewesen von Roland Gööck / Roland Gööck
Postal Laws and Regulations of the United States of America : Revised and edited in accordance with the act of confress approved February 23, 1931 / Walter F. Brown ( Postmaster General)
Postal Law and Regulations of Japan / Ministry of posts and Telecommunications
The postal Law : (english version) / Ministry of Communications Directorate General of Posts
Postal Laws and Regulations of the United States of America : Published in accordance with the act of congresso approved March 3, 1879; Arthur H. Bissell; ; Thomas B.Kirby