61
by Korhonen
Published 1994
62
by Gomez
Published 1999
63
by Weiss
Published 1990
64
65
66
Published 2005
67
Published 1996
68
by Bottelier
Published 1998
69
by Naisbitt
Published 1990
70
Published 2001
71
by Gupta
Published 1992
72
by Hiro
Published 1982
73
by Amuzegar
Published 1997
74
75
76
by Glain
Published 2004
77
Published 1993
78
Published 1973
79
80
by Nu'man
Published 1992