Robson, William Alexander, 1895-1980, author
Stevens & Sons Limited, 1951
Buku Teks
Jackson, Paul, author
Sweet & Maxwell, 1973
Buku Teks
Rawlings, Philip, author
Longman, 1999
Buku Teks
Ingman, Terence
Blackstone, 1994
Buku Teks
Powell, Edward, author
Oxford University Press, 1989
Buku Teks