1
2
by Khoo
Published 1967
3
by Khoo
Published 1969
4
by Khoo
Published 1987
5
by Khoo
Published 1986
6
7
8
by Khoo
Published 2005
9
by Khoo
Published 2007
10
11
by Lim
Published 2008
12
by Khoo
Published 2008
13
Published 2009
14
by Khoo
Published 2008
15
by Abdur-Razzaq Lubis
Published 2010