Postal Law and Regulations of Japan / Ministry of posts and Telecommunications
The postal Law : (english version) / Ministry of Communications Directorate General of Posts
Curso elemental de derecho postal : obra de texto de la escuela postal de los estados unidos de Venezuela / Francisco Velez-Salas
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