use Data::Dumper;

my @targets;
push @targets, { _source=>"s1", _name=>"n1" };
push @targets, { _source=>"s2", _name=>"n2" };

print Dumper(\@targets);
__END__
$VAR1 = [
          {
            '_source' => 's1',
            '_name' => 'n1'
          },
          {
            '_name' => 'n2',
            '_source' => 's2'
          }
        ];