Wedderburn, Lord
Penguin Books, 1986
Buku Teks
edited by David Nice
Councils and Education Press, 1986
Buku Teks SO
Bowers, John, 1956-
Blackstone Press, 1996
Buku Teks
Jefferson, Michael
Cavendish Publishing , 1994
Buku Teks
Bowers, John, 1956-
Blackstone Press, 1998
Buku Teks SO