The National Identity Board, 1995
Buku Teks
Blanchard, Wendell
Hraf Press, 1958
Buku Teks
Clarac, Achille
Kuala Lumpur Oxford University Press 1981
Buku Teks
Kirkup, James
A.S. Barnes and Company, 1968
Buku Teks
Young, Gordon
Winchester Press, 1970
Buku Teks