1
2
by Griswold Jr., John A.
Published 1939
3
4
by Appell, George N.
Published 1967
5
6
by Musa B. Ambai
Published 1999
7
by Rutter, Owen.
Published 1929
8
9
Published 2007
10
Published 1990
11
Published 2005
12
by Blood, Doris E.
Published 1995
13
14
by Muhammad Harun
Published 2009
15
16
17
Published 2015
18
19
20