The Brazilian telecommunications SAGA : from emperor Pedro II to the digital revolution / Ethevaldo Siqueira; trad. Kevin M. B. Mundy
The telegraph : how technology innovation caused social change / Annteresa Lubrano
Telecommunications : 20th century inventions / Chris Oxlade
Communication, technology, and politics in the information age / Gerald Sussman
Lisboa e as comunicações com a Europa / Fundação Portuguesa das Comunicações