1
by Said
Published 1981
2
by Slater
Published 1989
3
Published 1994
4
by King
Published 1993
5
by Hijab
Published 1988
6
Published 2008
7
by Shambaugh
Published 1991
8
by Smith
Published 1992
9
10
by Sigelman
Published 1991
11
Published 1990
12
by Shoemaker
Published 1995
13
by Billig
Published 1992
14
15
by Gordon
Published 1989
16
17
Published 1992
18
by Stimson
Published 1991
19
by King
Published 1993
20