Stone, Richard
Blackstone Press limited, 1997
Buku Teks
edited by Catherine Itzin
Oxford University Press, 1992
Buku Teks
Barker, Lucius J.
Prentice-Hall, 1978
Buku Teks
Abraham, Henry J.
Oxford University Press, 1982
Buku Teks
Way, H. Frank
McGraw-Hill, 1976
Buku Teks