Torga, Miguel
Portugal
Rua Cintura do Porto, 2003
 Buku Referensi
History of Portugal
Office of the Secretary of State for Information and Tourism, [Date of publication not identified]
 Buku Teks SO
Passport to Portugal
by Jose Saramago ... [and oters] ; edited by Mike Gerrard and Thomas McCarthy
Passport, 1994
 Buku Teks SO
Potter, E.B.
The Great Sea War : the Story of Naval Action in World WarII / E.B. Potter
Prentice-Hall, 1960
 Buku Teks SO
Lapidoth-Eschelbacher, Ruth
International straits of the world : the red sea and the gulf of aden, volume 5 /
Martinus Nijhoff, 1982
 Buku Teks