1
by غليون, -1945
Published 1991
2
by Cohen
Published 1992
3
by al-Murabit
Published 1988
4
by Ritchie
Published 1993
5
by Boahen
Published 1987
6
by Luard, 1926-
Published 1982
7
by Watson, 1914-
Published 1992
8
by Thornhill, C. J., 1966-
Published 2006
9
by Gierke
Published 1987
10
11
Published 1994
12
by Entelis
Published 1974
13
by Skinner
Published 1978
14
15
by Brint
Published 1991
16
Published 1989
17
by Sabine, 1880-1961
Published 1989
18
by Held
Published 1987
19
by Smith
Published 1986
20