1
Published 1975
2
by Malathronas, John
Published 2007
3
by Lester, Julius
Published 1968
4
Published 1992
5
Published 2001
6
7
Published 1995
8
by Mustapha Saud
Published 2013
9
by Thurai Raj
Published 2009
10
by Abisha Naim
Published 2012
11
by Hostetler, Bob
Published 2006
12
Published 2013
13
Published 1976
14
Published 1988
15
by Prasso, Sheridan
Published 2006
16
17
by Buchanan, Iain.
Published 1972
18
by Wardrop, A. Tucker.
Published 1897
19
Published 1989
20
by Tan, Chee-Beng
Published 1988