Puxon, Margaret
Penguin Books, 1971
Buku Teks
Pace, P.J.
Pitman, 1992
Buku Teks
Seng, Kenneth Wee Kim
University of Singapore, 1976
Buku Teks
Menski, Werner F.
Curzon Press, 2001
Buku Teks
university of Malaya Press, [date of publication not identified]
Buku Teks