The posters so far don't seem to have looked up the CGI perldoc before posting. In any case, in order to create a popup menu with labels different from the values, you need to be using both the -values parameter and the -labels parameter. This first of those takes a list reference, and the second a hash reference. So let's take a look at what they require.

As it stands now, you're passing into -values a structure like this:

[ { '1' => { 'Author' => 'Mike', 'idAuthor' => '1' },
    '2' => { 'Author' => 'Cecil', 'idAuthor' => '2' } } ]
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when what you need to do is pass a structure like this as the -values parameter: [ '1', '2' ], and this as the -labels parameter:

{ '1' => 'Mike',
  '2' => 'Cecil' }
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So the question is, how do you go from one to the other? As with many structure reformulations, the answer is with a clever use of map:

my $values_list = [ sort(keys(%$hash_ref)) ];
my $labels_href =
  { map {$_->{idAuthor} => $_->{Author}} values(%$hash_ref) };
print $cgi->popup_menu(-name=>'menu_name',
                  -values=>$values_list, -labels=>$labels_href);
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If you don't like the order authors are shown in once you have ten or more, change the sort call above so that it sorts numerically.