1
Published 2004
2
Published 2010
3
by Boeije
Published 2010
4
by Patton
Published 2002
5
by Hart
Published 2001
6
by Hart
Published 2001
7
Published 2000
8
by Piaw
Published 2012
9
by Piaw
Published 2013
10
11
by Fowler
Published 2014
12
by Pallant
Published 2016
13
by Hedderson
Published 1993
14
by Boruch
Published 1997
15
by Yin
Published 1994
16
by Hardy
Published 1993
17
by Berry
Published 1993
18
by Girden
Published 1992
19
by Bourque
Published 1992
20
by Jaccard
Published 1990