Heuston, R.F.V.
Clarendon Press , 1987
Buku Teks
Heuston, R.F.V.
Sweet & Maxwell, 1977
Buku Teks
Pannick, David
Oxford University Press , 1987
Buku Teks
Hollander, Barnett, author
Bowes & Bowes, 1965
Buku Teks
Bowen, Catherine Drinker
Little, Brown & Co., 1957
Buku Teks