Downes, T. Antony, author
Blackstone, 1995
Buku Teks
Downes, T. Antony, author
Blackstone Press, 1993
Buku Teks
Downes, T. Antony, author
Black Stone Press, 1997
Buku Teks
Burrows, William E., author
W.B. Saunders, 1959
Buku Teks
Rampal, K.K.
Oxford & IBH, 1982
Buku Teks