1
Published 1990
2
by Arifin Haji Zainal
Published 1985
3
by Hyland, Bruce
Published 1994
4
by Du Brin, Andrew J.
Published 2002
5
by Coates, Del
Published 2003
6
7
by Kolb, David A.
Published 1995
8
Published 1990
9
by Powell, Dick
Published 1985
10
by Dailey, Charles A.
Published 1984
11
by Dichter, Ernest
Published 1987
12
by de Bono, Edward
Published 1991
13
by Powell, Dick
Published 1985