Hooker, M. B., author
Malaya Law Review, 1967
Buku Teks
Artikel Jurnal
Postema, Gerald J., author
Clarendon Press, 1986
Buku Teks
Plucknett, Theodore F. T.
Little, Brown and Company, 1956
Buku Teks
Hardijan Rusli, author
Pustaka Sinar Harapan, 1996
Buku Teks