1
by Lee, Poh Ping.
Published 1978
2
3
4
Published 1997
5
by Choi
Published 2004
6
by Huxley
7
8
9
by Chan
Published 1971
10
by Josey
Published 1970
11
12
by Phang
Published 1994
13
by Lim
Published 2002
14
Published 1999
15
Published 1999
16
by Tan, Sumiko
Published 2000
17
Published 2013
18
by Pang
Published 1971
19
by Jayakumar
Published 2009
20
Published 1992