1
by Hague, Paul
Published 1993
2
by Rusk, Tom
Published 1990
3
by Chance, Paul
Published 1979
4
by De Bono, Edward, 1933-
Published 1990
5
by White, Robert W.
Published 1975
6
by McElroy, Robert W.
Published 1992
7
8
by De Bono, Edward, 1933-
Published 1967
9
10
by Albert, Ethel M.
Published 1984
11
Published 1999
12
by Leigh, David
Published 1995
13
14
by Covey, Stephen R.
Published 1989
15
Published 1999
16
by Kung, Hans, 1928-
Published 1998
17
by De Bono, Edward, 1933-
Published 1990
18
19
20
by Mannoni, Octave
Published 1990