41
by Hero, Alfred O.
Published 1965
42
by Mehnert, Klaus, 1906-
Published 1963
43
44
Published 1997
45
by Bush, George
Published 1998
46
by Rubinstein, Alvin Z.
Published 1985
47
by Kirk, Donald, 1938-
Published 1998
48
Published 2001
49
by Dixit, J. N, 1936-
Published 2002
50
51
52
by Friedberg, Aaron L.
Published 2011
53
Published 1990
54
by Kagan, Donald
Published 2000
55
56
Published 1971
57
Published 1949
58
by Smith, Karen E
Published 1999
59
by Spanier, John
Published 1985
60
Published 1991