1
by De Bono, Edward, 1933-
Published 1996
2
by Blackburn
Published 1999
3
by Ainon Mohd. 1950-
Published 1996
4
by Ainon Mohammad, 1950-
Published 2005
5
by de Bono, 1933-
Published 1995
6
by De Bono, 1933-
Published 1996
7
by Leo
Published 2006
8
9
by Buzan
Published 2004
10
by Buzan
Published 2003
11
by Buzan
Published 2001
12
by Buzan
Published 2002
13
by De Bono
Published 2000