Hatten, Timothy S., author
Prentice-Hall, 1997
Buku Referensi
Teik, Khoo Boo, author
Aed Book, 2003
Buku Teks
The Johns Hopkins University Press, 1995
Buku Teks
The University of North Carolina Press, 1987
Buku Teks
Hagedorn, Ann
Simon & schuster, 2002
Buku Teks