Bruyn, Severyn T., author
The University of Michigan Press, 2000
Buku Teks
Finegan, Edward, author
Cambridge University Press, 2006
Buku Teks
Friedman, Thomas L., author
Penguin Book, 2006
Buku Teks
Kennedy, Paul M
Vintage Books, 1993
Buku Teks
Gilchrist, Gavin, author
Allen & Unwin, 1994
Buku Teks