1
by Robert L. Herd
Published 2008
2
3
by De Bono, 1933-
Published 1991
4
by Yeoh
Published 1993
5
by Boffey
Published 1994
6
by Gerber
Published 1991
7
8
by Schilit
Published 1994
9
10
by DeVrye
Published 1994
11
by Chitwood
Published 1996
12
by Maznah Hamid
Published 1994
13
by George
Published 1997
14
by Stewart
Published 1998
15
by Lessem
Published 1985
16
17
by Kay
Published 1993
18
by Kleiner
Published 2003
19
by Scott
Published 2009
20