Powell, Richard R.B., author
Foundation Press, 1952
Buku Teks
Dowling, Noel T., author
Foundation Press, 1952
Buku Teks
Hall, Kermit L., author
Oxford University Press, 1991
Buku Teks
Tillotson BA., John
Cavendish Publishing Limited, 1996
Buku Teks
Ginsburg, Ruth Bader, author
West Publishing, 1978
Buku Teks