Curtis, William J.R., author
Prentice-Hall, 1996
Buku Teks
Meredith, Carol, author
Rockport Publishers, 2000
Buku Referensi
Zevon, Susan, author
Rockport Publishers, 1996
Buku Teks
Encarna Castillo, editor
Harper Design International, 2003
Buku Referensi
Kubba, Sam, author
McGraw-Hill, 2003
Buku Teks