1
2
3
by De Bono, Edward
Published 1991
4
5
Published 2001
6
by Sutch, Peter
Published 2001
7
8
Published 2001
9
10
by Mastenbroek, Willem F. G.
Published 1989
11
by Hindle, Tim
Published 1998
12
Published 1997
13
by Cox, Geof
Published 1992
14
15
16
17
by Hirst, David
Published 2007
18
by Byrne, Rhonda
Published 2006
19
by Albrecht, Karl
Published 2007
20