Russell-Wood, A.J.R., author
Assirio & Alvin, 1998
Buku Teks
Torga, Miguel, author
Rua Cintura do Porto, 2003
Buku Referensi
Office of the Secretary of State for Information and Tourism, [date of publication not identified]
Buku Teks
by Jose Saramago ... [and oters] ; edited by Mike Gerrard and Thomas McCarthy
Passport, 1994
Buku Teks
Potter, E. B.
Prentice-Hall, 1960
Buku Teks