Dine, Janet, author
Blackstone Press, 1998
Buku Referensi
Beatson, J.
Claredon Press, 1983
Buku Teks
Ivamy, E.R. Hardy, author
Butterworth, 1977
Buku Teks
Ivamy, E.R. Hardy
Llod's of London Press, 1082
Buku Teks
Barendt, E. M., author
Oxford University Press, 1998
Buku Teks