Trainer, Timothy P, author
Thomson, 2006
Buku Teks
Gildea, Robert
Oxford University Press , 1988
Buku Teks
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