1
by Collcutt
Published 1988
2
by Velayati
Published 2008
3
Published 1922
4
5
6
by Ibn Khaldun, 1332-1406
Published 1985
7
8
Published 1994
9
by Bunson
Published 1991
10
11
Published 2005
12
Published 2005
13
Published 2005
14
Published 2005
15
Published 2005
16
by Roaf
Published 1990
17
by Baines
Published 1980
18
by Smith
Published 2008
19
20
by Ruthven
Published 2004