1
Published 2000
2
3
by Murphy
Published 2002
4
Published 1969
5
by Owen
Published 2000
6
Published 2002
7
by Hawking
Published 1993
8
by Boulter
Published 2002
9
by Norain Mohd Rejab
Published 2000
10
by Burke
Published 1985
11
by Fischer
Published 1996
12
Published 2008
13
Published 2007
14
by Grix
Published 2004
15
16
17
by Smout, T.C.
Published 2009
18
Published 2010
19
by Kluger, Jeffrey
Published 2013
20