Dittrich, Guy, editor
teNeues, 2006
Buku Referensi
Aurora Cuito, Alejandro Bahamón, Wendy Griswold
HBI, 2001
Buku Teks SO
edited by martin Nicholas Kunz
teNeues, 2003
Buku Teks SO
Epstein, Adam
Pearson/Prentice Hall, 2006
Buku Teks SO
Entwistle, Jill
Roto Vision SA, 2000
Buku Referensi