1
by Rich
Published 2010
2
by RUDESTAM
Published 2007
3
by Rozakis
Published 2007
4
by Fisher
Published 2010
5
by RUDESTAM
Published 2001
6
by BAUGH
Published 1997
7
by WINKLER
Published 1999
8
by GRAHAM
Published 1994
9
by Langan
Published 2011
10
by Barnas
Published 2013
11
by Weissberg
Published 1990
12
by Clouse
Published 2008
13
by Robson
Published 2007
14
by Campbell
Published 1999
15
by Dietsch
16
by Wingersky
Published 2009
17
by McKane
Published 2014
18
by Strunk, William
Published 2000
19
by Anderson
Published 2008
20
by Netzley
Published 2001