1
Published 1997
2
by Athukorala, Prema-chandra
Published 2001
3
by Universiti Sains Malaysia
Published 2001
4
5
Published 1996
6
Published 1997
7
8
Published 1998
9
Published 1998
10
Published 1998
11
12
13
by Kamal Salih
Published 1985
14
by Nathanail, C. Paul
Published 2004
15
16
17
by Dorall, R. F.
Published 1986
18
Published 1997
19
Published 2010
20
by McCleskey, Scott
Published 2010