1
by Meny
Published 1993
2
by Sohrabi
Published 2011
3
Published 1989
4
by Rousseau
Published 1987
5
6
7
by Strom
Published 1990
8
Published 1992
9
10
by Hague
Published 1992
11
by Mahler
Published 1992
12
by Nagle
Published 1992
13
by Greene, 1937-
Published 1990
14
Published 1990
15
by Lijphart
Published 1977
16
Published 1986
17
18
by Roskin
Published 1992
19
Published 1983
20
by Wang
Published 1994