1
by Adler, Alfred
Published 1962
2
by Khoo, Kheng-Hor, 1956-
Published 2006
3
by Hasan Muhd Hj. Al Khair
Published 2005
4
5
by Ziglar, Zig
Published 1997
6
Published 2006
7
8
by Ziglar, Zig
Published 1998
9
by Albrecht, Karl
Published 2007
10
11
by Covey, Stephen R.
Published 1994
12
by Griffin, Douglas, 1946 -
Published 2002
13
14
Published 1997
15
by Somersall, Allen C.
Published 1997
16
by Somersall, Allen C.
Published 1997
17
18
Published 2006
19
by Rafi Harumin, 1982-
Published 2013