1
by Urichuck
Published 2001
2
by Kaplan, 1935-
Published 1995
3
by Covey
Published 1990
4
by Skopec
Published 1991
5
6
by Zuker
Published 1991
7
by Robbins
Published 1986
8
by Ainon
Published 2003
9
by Thomas
Published 1992
10
11
by Robbins
Published 2003
12
by Sharma
Published 2006
13
by Kanoy
Published 2013