Ewing, David W., author
McGraw-Hill, 1978
Buku Teks
Abraham, Henry J., author
Oxford University Press, 1982
Buku Teks
Abraham, Henry J., author
Oxford University Press, 1988
Buku Teks
Stone, Richard
Blackstone Press limited, 1997
Buku Teks
edited by Catherine Itzin
Oxford University Press, 1992
Buku Teks