1
by Smith
Published 2000
2
Published 2003
3
Published 2000
4
by Parris
Published 1993
5
Published 2008
6
7
Published 2007
8
Published 2008
9
10
by Tannahill
Published 2003
11
Published 2001
12
13
by Jones
Published 1994
14
by Ramseyer
Published 1993
15
Published 1995
16
Published 1979
17
by Punnett
Published 1980
18
by Johnson
Published 1980
19
20
by Ajami
Published 1993