Cerver, Francisco Asensio, author
Konemann, 2000
Buku Teks
Phoenix Publishing Limited, 2011
Buku Referensi
Gluck, Peter L., author
Rockport Publishers, 1997
Buku Teks
Crosbie, Michael J., author
Rockport Publishers, 1998
Buku Teks
Crosbie, Michael J., author
Rockport Pub., 1998
Buku Teks