C.S. Lim
The Department of English University of Malaya, [date of publication no identified]
Buku Teks
Griffiths, Percival, Sir, 1899-
Ernest Benn, 1969
Buku Teks
The World bank, 2007
Buku Teks
The Association of Commonwealth Universities,
Buku Referensi
Underhill, Frank H.
Duke University Press, 1956
Buku Teks