1
by De Bono, Edward, 1933-
Published 1993
2
by Elfstrom, G
Published 1990
3
by Hartman, Laura P.
Published 2008
4
by Kurtz, Paul W, 1925-
Published 1966
5
by Molden, David.
Published 2011
6
by Govier, Trudy
Published 1985
7
Published 1993
8
by Clegg, Brian
Published 2000
9
by Sofo, Frank
Published 2004
10
by Platt, Washington
Published 1961
11
by Gabor, Don
Published 1994
12
by Sulsky, Lorne
Published 2005
13
by Hague, Paul
Published 1993
14
15
by Rusk, Tom
Published 1990
16
by Chance, Paul
Published 1979
17
by De Bono, Edward, 1933-
Published 1990
18
by Kindler, Herb
Published 2002
19
by White, Robert W.
Published 1975
20
by McElroy, Robert W.
Published 1992