1
by Thornhill, C. J., 1966-
Published 2006
2
by Wolin
Published 2004
3
by Skinner
Published 1978
4
5
6
by Baradat
Published 1991
7
Published 1989
8
by Sabine, 1880-1961
Published 1989
9
by Black
Published 2001
10
by Gierke
Published 1987
11
by Unger
Published 1975
12
by Held
Published 1987
13
14
by Nicholson, 1940-
Published 1990
15
16
Published 1991
17
18
by Skinner
Published 1978
19
Published 1988
20
by Noer
Published 1997