61
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Published 1980
62
by Bloom, David E, 1955-
Published 2001
63
by Seligman, A.
Published 1992
64
by Jerichow, Anders.
Published 1997
65
66
Published 1992
67
Published 1995
68
by Heywood, Andrew.
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69
by Ball, Alan R.
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70
Published 2001
71
by Delanty, Gerard.
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72
by Savage, Mike, 1959-
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73
74
Published 1978
75
76
by Johnston, R. J
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77
by Richards, S. G.
Published 1978
78
79
by Moore, Margaret, Ph. D.
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80
by Bowers, John, 1956-
Published 1999