Poh Chu Chai
Longman, 199
Buku Teks
Mustill, Michael J., Sir, author
Stevens & Sons, 1981
Buku Teks
Mustill, Michael J., Sir, author
Steven & Sons, 1981
Buku Teks
Federal Republic, author
Wiesbaden : Wiesbadener Graphische Betriebe GmbH, 1977
Buku Referensi
Birnie, Patricia W., author
Clarendon Press, 1995
Buku Teks