Godsey, Lisa, author
Fairchild Books, 2010
Buku Teks
Binggeli, Corky
John Wiley & Sons, 2008
Buku Teks
Geddes-Brown, Leslie, author
Page One, 2000
Buku Referensi
Brookes, John, author
Ward Lock, 1996
Buku Referensi
A Ward Lock Book, 1997
Buku Referensi