1
Published 1997
2
by Lane
Published 1987
3
by Ahmed
Published 1983
4
by Poliakov
Published 1991
5
by Gernet
Published 1972
6
by Ong
Published 1994
7
by Gullick
Published 1987
8
by Hurgonje
Published 1996
9
by Rustam A. Sani
Published 1993
10
by Mohd. Zamberi A. Malek
Published 1994
11
by Muhammad Idris Saleh
Published 1994
12
13
14
by A. Aziz Deraman
Published 2005
15
by A.Samad Idris
Published 1996
16
by Kennedy
Published 2004
17
18
Published 2004
19
Published 1988
20
by Dupont
Published 1994