1
by Bhutto
Published 1969
2
by Josey
Published 1970
3
4
by Somjee
Published 1982
5
by Chandra Muzaffar
Published 1989
6
by Hng
Published 2004
7
by Rhodes
Published 1972
8
9
Published 2005
10
by Endacott
Published 1964
11
Published 2007
12
by Dosch
Published 2007
13
14
by Hepburn
Published 1980
15
by Cook
Published 1979
16
by Hancock
Published 1989
17
by Wang
18
by Wilson
Published 1994
19
by Pandey
Published 1980
20
by Jayum
Published 1993