1
Published 1972
2
Published 1976
3
by Omara, Ojungu, Peter
Published 1992
4
5
by Marshall, Graham R
Published 2005
6
Published 1982
7
8
by Katiman Rostam
Published 2006
9
by Burkill, I. H.
Published 1966
10
Published 1982
11
Published 1967
12
13
by Cubbage, Frederick W.
Published 2022
14
Published 2014