Winter, Robert, author
Simon & Schuster, 1996
Buku Referensi
Shaw, Ros Byam, author
Page One Publishing, 2001
Buku Referensi
Hacker, Louis M., author
Columbia University Press, 1947
Buku Teks
Hacker, Louis M., author
Columbia University Press, 1947.
Buku Teks
Tang, Song, author
Intercontinental Press, 2007
Buku Teks