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
11
by Jones
Published 1994
12
by Ramseyer
Published 1993
13
Published 1995
14
Published 1979
15
by Punnett
Published 1980
16
by Johnson
Published 1980
17
18
by Ajami
Published 1993
19
by Goldman
Published 1994
20
by Grant
Published 1979