1
2
by Abdul Latiff Abu Bakar
Published 1998
3
by Deng, Francis Mading, 1938-
Published 1989
4
by Allen, Jamie
Published 1997
5
by Englebert, Pierre, 1962-
Published 1996
6
by Friedman, Thomas L.
Published 1989
7
by Aspinall, Edward
Published 2003
8
by Aspinall, Edward
Published 2005
9
by Davies, Matthew N, 1966-
Published 2006
10
11
by Thanet, Aphornsuvan
Published 2007
12
13
Published 2001
14
by Odom, William E.
Published 1992
15
by Forster, Keith, 1947-
Published 1990
16
Published 2001
17
Published 2000
18
by Elliot, Matthew
Published 1996
19
20
by Tiffen, Rodney
Published 2001