1
by Ziglar, Zig
Published 1985
2
by Moore, Diane
Published 2005
3
by Covey, Stephen R.
Published 2009
4
5
by Hor, Jennifer
Published 2006
6
by Kraehmer, Steffen T.
Published 1990
7
by Campion, Mukti Jain.
Published 1993
8
by Rosemond, John
Published 2005
9
Published 2007
10
by Ladd, Karol
Published 2001
11
Published 2005
12
by Kelly, Kate
Published 1996
13
14
Published 2007
15
16
by Roehlkepartain, Jolene L.
Published 2006
17
by Hamner, Tommie J.
Published 1990
18
by Fuller, Cheri.
Published 1998
19
by Fu, Jing Jing
Published 2006
20
by Kuyper, Vicki
Published 2006