Aurora Cuito, Alejandro Bahamón, Wendy Griswold
HBI, 2001
Buku Teks
edited by martin Nicholas Kunz
teNeues, 2003
Buku Teks
Dittrich, Guy, editor
teNeues, 2006
Buku Referensi
Epstein, Adam
Pearson/Prentice Hall, 2006
Buku Teks
McGraw-Hill, 1960
Buku Teks