Elliot, Catherine, author
Longman , 2001
Buku Teks
Brown, Ian, author
Blackstone, 1994
Buku Teks
McKendrick, Ewan, author
Macmillan, 1994
Buku Teks
Stone, Richard, author
Cavandish , 2003
Buku Teks
Atiyah, P.S., author
Clarendon Press, 1989
Buku Teks