
1.		Postal Law and Regulations of Japan / Ministry of posts and Telecommunications Data Publicação: 1969
2.		Dokumentation über das post- und fernmeldewesen von Roland Gööck / Roland Gööck Autor: Gööck, Roland
3.		The postal Law : (english version) / Ministry of Communications Directorate General of Posts Data Publicação: 1956
4.		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) Autor: F. Brown, Walter Data Publicação: 1932
5.		Commentarios ao regulamento dos correios do Brasil / Francisco José de Almeida Brant; pref. Faria Rocha Autor: Brant, Francisco José de Almeida Data Publicação: 1911
6.		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 Data Publicação: 1879