21
22
23
by Al-Attas, Syed Ali Tawfik
Published 2005
24
by Sullivan, Denis J.
Published 1999
25
Published 2005
26
Published 2000
27
Published 2010
28
29
30
by Firdaus Zalani, Ustaz, 1989-
Published 2015
31
Published 2008
32
Published 2005