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
Diccionario de la legislacion vigente de correos : [Espanha]
Curso elemental de derecho postal : obra de texto de la escuela postal de los estados unidos de Venezuela / Francisco Velez-Salas