1
Published 2007
2
Published 2006
3
by LANDA
Published 2001
4
by WEISHAR
Published 1998
5
Published 2000
6
by Kleiner
Published 2001
7
Published 2011
8
by Fichner-Rathus
Published 2015
9
by Gibbons
Published 2005
10
by White
Published 2007
11
by Johnson
Published 2006
12
by Stokstad
Published 2007
13
by Fichner-Rathus
Published 2008
14
by Kleiner
Published 2009
15
by Krum
Published 2014
16
by HELLER
Published 2012
17
by Allen
Published 2012
18
by Ahmad Sanusi Hassan
Published 2004
19
by Hodge
Published 1996
20
by Dabner
Published 2010