Leyland, Peter
Blackstone Press limited, 1999
Buku Teks
Thompson, Brian
Balckstone Press Limited, s.a.
Buku Teks
Wade, H. W. R.
Clarendon Press, 1971
Buku Teks
Schwartz, Bernard, author
Little, Brown & Co., 1991
Buku Teks
Wade, H.W.R.
Claredon Press, 1994
Buku Teks